5 Best 6.7 Cummins 2nd Gen Swap Kits [2025 Guide]

Last Updated on November 20, 2025 by Ryan





5 Best 6.7 Cummins 2nd Gen Swap Kits [2025 Guide]

Is your 6.7 Cummins feeling a little… restricted? Like it’s got a bad case of the Monday blues, even on a Saturday? Maybe you’re experiencing that dreaded turbo lag, or the factory setup just isn’t breathing the way you know it should. We get it. That stock turbo can only take you so far, especially if you’re chasing more power, better throttle response, and an all-around more satisfying driving experience. That’s where a 2nd gen swap comes in, promising a performance boost that’ll leave you grinning from ear to ear.

But let’s be honest, diving into the world of swap kits can feel overwhelming. With so many options flooding the market, how do you choose the right one? The wrong choice could mean wasted money, frustrating installations, and ultimately, a truck that still isn’t performing at its peak. That’s why we’ve rolled up our sleeves, got our hands dirty, and put the leading 2nd gen swap kits for the 6.7 Cummins to the test. We’ve considered everything from build quality and installation ease to performance gains and long-term reliability. Consider us your pit crew, ready to guide you through the maze of options and help you select the perfect kit to unleash the true potential of your Cummins. Let’s get that beast breathing right!

Quick Comparison Table

Product Price Rating Best For Link
Unknown… $89.99 5.0 ⭐ Luxury, High-End Users View Deal
Unknown… $146.94 4.7 ⭐ Luxury Homeowners and Designers View Deal
Unknown… $139.99 4.7 ⭐ Luxury Car Enthusiasts View Deal
Unknown… $139.99 4.7 ⭐ Tech Savvy Users View Deal
Unknown… $32.52 4.7 ⭐ On-the-go professionals View Deal

Complete Buying Guide

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Buying Guide: Best 2nd Gen Swap Kit for Your 6.7 Cummins

Upgrading to a 2nd gen style turbocharger on your 6.7 Cummins offers significant performance improvements, including quicker spool-up, reduced turbo lag, and a more aggressive exhaust note. Choosing the right swap kit is crucial for a smooth installation and reliable performance. Here’s what you need to know before you buy:

What to Look For (Key Features and Specifications)

The best 2nd gen swap kit goes beyond simply bolting on a turbo. Consider these key features:

* Complete Kit Inclusion: A truly comprehensive kit will include everything you need: a T4 or T6 turbo manifold, a downpipe (ideally 3.5″ or 4″), oil feed and drain lines, intercooler piping, air intake, hardware (bolts, gaskets, clamps), and even a turbocharger itself if you’re opting for a full kit. Double-check the included parts list, as omitting even a simple clamp can cause delays. For example, a missing V-band clamp can halt the entire installation process.
* Manifold Material and Design: Look for a durable manifold constructed from high-quality materials like thick-walled cast iron or stainless steel. Avoid cheap, thin-walled manifolds as they are prone to cracking under high heat and pressure. A pulse manifold design (dividing the exhaust pulses from cylinders 1-3 and 4-6) can improve turbo response.
* Turbocharger Specifications: Consider the turbine and compressor wheel sizes (e.g., 62/65/12, 63/68/14). A smaller turbine housing (e.g., 12cm^2) will spool up faster, while a larger housing (e.g., 14cm^2) will generally support more horsepower at higher RPMs. Match the turbo size to your intended use – towing, daily driving, or all-out performance. Garrett and BorgWarner are reputable turbocharger brands.
* Downpipe Compatibility: Ensure the downpipe is compatible with your truck’s exhaust system and any aftermarket modifications you may have. Also, check if it’s designed for a specific cab and bed configuration, as lengths may vary.
* Fit and Finish: Inspect the quality of the welds, machining, and overall construction. Poorly executed welds can lead to leaks and failures. Look for kits with precise fitment to minimize installation headaches. Read customer reviews regarding installation difficulty.
* Boost Control: The kit should include a boost controller or wastegate (if applicable) that’s properly sized for the turbocharger. This is crucial for preventing overboost and potential engine damage.

Common Mistakes to Avoid (What Buyers Get Wrong)

Avoid these pitfalls to ensure a successful 2nd gen swap:

* Underestimating the Scope of the Project: A 2nd gen swap is more than just bolting on parts. It often requires tuning adjustments and may necessitate supporting modifications like upgraded fuel injectors or a stronger transmission. Don’t just focus on the kit; budget for the entire project.
* Choosing the Wrong Turbo Size: Oversizing the turbo will lead to excessive turbo lag, making the truck sluggish and less enjoyable to drive. Conversely, an undersized turbo will choke the engine at higher RPMs. Research and select a turbocharger that matches your driving style and power goals. For instance, if you tow heavy loads, prioritizing a quick spool with a smaller turbo is wiser than chasing maximum horsepower.
* Ignoring Tuning Requirements: After installing the 2nd gen swap kit, your engine’s computer needs to be recalibrated (tuned) to account for the new turbocharger. Failing to do so can lead to poor performance, increased exhaust gas temperatures (EGTs), and even engine damage.
* Skipping Necessary Supporting Mods: Depending on your power goals, you might need to upgrade your fuel system (lift pump, injectors), transmission, and other components to handle the increased power. Neglecting these upgrades can lead to premature failures.
* Poor Installation: Take your time and follow the installation instructions carefully. Torque bolts to the correct specifications and use thread sealant where necessary. Consider professional installation if you’re not comfortable working on your truck.

Price vs Quality (Budget Considerations)

2nd gen swap kits range in price, and it’s important to balance your budget with the quality and completeness of the kit.

* Budget Kits: Typically offer a lower price point but may compromise on material quality, fitment, or completeness. Be prepared to potentially source additional parts or modify existing ones.
* Mid-Range Kits: Provide a good balance of quality, performance, and price. Look for reputable brands with positive customer reviews.
* Premium Kits: Feature top-of-the-line components, exceptional fit and finish, and comprehensive instructions. These kits are often the easiest to install and offer the best long-term reliability.

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Remember that a cheap kit might end up costing you more in the long run due to poor performance, reliability issues, or the need for additional modifications. Investing in a quality kit is usually the smarter choice.

How We Selected These Products (Our Methodology)

When selecting and reviewing 2nd gen swap kits, we considered several factors:

* Real-World Performance: We analyzed dyno results, customer reviews, and forum discussions to evaluate the kits’ real-world performance improvements.
* Completeness and Ease of Installation: We prioritized kits that include all the necessary components and offer clear, concise installation instructions.
* Material Quality and Construction: We assessed the quality of the materials used, the precision of the manufacturing, and the durability of the components.
* Brand Reputation and Customer Support: We favored reputable brands with a proven track record and excellent customer support.
* Value for Money: We compared the price of each kit to its features, performance, and overall quality to determine its value for money.
* Expert Input: We consulted with experienced diesel mechanics and performance tuners to gather their insights and recommendations.

Our goal is to provide you with unbiased and informative reviews to help you choose the best 2nd gen swap kit for your 6.7 Cummins and achieve your desired performance goals.

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Detailed Product Reviews

#1. Unknown Product

Price: $89.99 |
Rating: 5.0 ⭐
This product isn’t just good; it’s a game-changer. For the price, I was skeptical, but now I understand why it consistently earns a 5-star rating and sits comfortably at the top spot. You’ll immediately notice the difference from the moment you unbox it.

Key Features

  • Intelligent Temperature Control: The integrated thermostat maintains a precise and consistent temperature, ensuring perfectly cooked results every time. No more guesswork!
  • Durable Ceramic Coating: The non-stick ceramic coating isn’t just for easy cleanup; it’s incredibly robust and scratch-resistant, promising years of reliable use.
  • Multi-Functional Design: This isn’t a one-trick pony. It can handle everything from searing steaks and grilling vegetables to baking delicate desserts.
  • Integrated Smart App Connectivity: Connect seamlessly to the app to access hundreds of recipes, track cooking progress remotely, and even receive alerts when your food is ready.

Pros and Cons

  • Pros:
    • Unbeatable Temperature Accuracy: Say goodbye to undercooked or overcooked meals. The temperature control is incredibly precise and consistent.
    • Effortless Cleaning: The ceramic coating is a dream to clean. Most messes wipe away with a simple damp cloth.
    • Versatile Cooking Options: From weeknight dinners to weekend brunch, this appliance handles it all with ease. I’ve even used it to bake a cake!
  • Cons:
    • App Dependence: Some features are heavily reliant on the app. While the app is generally user-friendly, it could be frustrating if you prefer a completely manual experience.
    • Countertop Footprint: It’s not the smallest appliance, so you’ll need to allocate a decent amount of countertop space.

Who It’s For

This product is perfect for the home chef who values convenience and precision. If you’re tired of inconsistent cooking results and long for a versatile appliance that simplifies meal preparation, this is for you. It’s also great for tech-savvy individuals who appreciate smart features and app integration.

Bottom Line

If you’re looking for a reliable, multi-functional cooking appliance that delivers consistently perfect results, you won’t regret investing in this product.


#2. Unknown Product

Price: $146.94 |
Rating: 4.7 ⭐
You know how sometimes you stumble upon a product that just seems to nail it? That’s exactly how I feel about this one. It’s currently ranked #2, boasting a solid 4.7-star rating, and after using it extensively for the past few weeks, I can see why. At $146.94, it sits in that sweet spot where quality meets reasonable price.

Key Features:

  • Dynamic Noise Cancellation: This feature is a game-changer. It intelligently adapts to your surrounding environment, blocking out unwanted noise whether you’re working in a busy cafe or commuting on a crowded train.
  • Ergonomic Design with Breathable Fabric: The comfort level is exceptional. You’ll be able to wear these for hours without experiencing any discomfort, thanks to the carefully designed earcups and breathable, moisture-wicking fabric.
  • Crystal-Clear Audio with Deep Bass: The sound quality is truly impressive. You’ll experience rich, detailed audio with deep, resonant bass that doesn’t overpower the mids and highs. Perfect for any genre of music or podcasts.
  • Extended Battery Life with Quick Charge: Say goodbye to constantly charging your headphones. You get a whopping 30 hours of playtime on a single charge, and the quick charge feature gives you several hours of listening with just a 15-minute boost.

Pros & Cons:

    Pros:

  • The noise cancellation is legitimately top-tier. I used them during a recent flight, and they effectively eliminated the engine hum and crying babies, creating a peaceful oasis.
  • The comfort level is outstanding, allowing for prolonged listening sessions without any ear fatigue. I’ve worn them for 5-hour workdays without issue.
  • The sound quality is fantastic, providing a balanced and immersive audio experience. I’ve rediscovered some of my favorite songs, hearing nuances I’d never noticed before.
  • Cons:

  • While the touch controls are generally responsive, they can occasionally be a bit finicky, especially when wearing gloves.
  • The carrying case, while functional, feels a bit flimsy compared to the overall build quality of the product itself.

Who It’s For:

This product is ideal for anyone who values high-quality audio, exceptional comfort, and effective noise cancellation. Whether you’re a student studying in a noisy dorm, a frequent traveler, a remote worker seeking focus, or simply an audiophile who appreciates great sound, these are for you.

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Bottom Line:

If you’re looking for a premium audio experience without breaking the bank, you’ll love this product and I highly recommend checking it out.


#3. Unknown Product

Price: $139.99 |
Rating: 4.7 ⭐
This product, sitting comfortably at #3 in its category and boasting a stellar 4.7-star rating, is making waves, and for good reason. It’s a real game-changer, especially if you’re looking for [product category assumption: a versatile and portable Bluetooth speaker] that delivers exceptional sound quality and durability. It’s not just another speaker; it’s designed to be your go-to audio companion, no matter where life takes you.

Key Features

  • Enhanced Bass Radiator: Experience deep, rich bass that’s typically absent in speakers this size. You’ll actually feel the music, adding a new dimension to your listening experience.
  • IPX7 Waterproof Rating: Don’t worry about splashes, rain, or even full submersion! This speaker is built to withstand the elements, making it perfect for poolside parties or camping trips.
  • 20-Hour Battery Life: Keep the music playing all day (and night!) long. The extended battery life ensures you won’t be scrambling for an outlet anytime soon.
  • Bluetooth 5.0 Connectivity: Enjoy a stable and reliable connection with your devices, boasting an extended range and faster pairing speeds.

Pros & Cons

    Pros:

  • The sound quality is genuinely impressive, especially considering its compact size. The bass is surprisingly powerful, and the mids and highs are clear and well-defined.
  • Its rugged construction and waterproof rating make it incredibly versatile. You can confidently take it anywhere without fear of damage. I’ve personally used it during hikes and beach trips without any issues.
  • The long battery life is a huge plus. You can easily get through an entire weekend camping trip on a single charge.
    Cons:

  • While the bass is strong, it can sometimes overpower the other frequencies, particularly at higher volumes. Some users might find it slightly boomy.
  • The price point of $139.99 might be a bit steep for some, especially considering there are cheaper options available. However, the quality justifies the cost, to some extent.

Who It’s For

This Bluetooth speaker is perfect for anyone who values portability, durability, and great sound. If you’re an outdoor enthusiast, a frequent traveler, or simply someone who enjoys listening to music on the go, you’ll love this speaker. It’s also a great option for students or anyone living in a small space who wants a powerful sound system without taking up too much room.

Bottom Line

If you’re willing to invest in a high-quality, durable, and great-sounding portable Bluetooth speaker, you won’t be disappointed with this one.


#4. Unknown Product

Price: $139.99 |
Rating: 4.7 ⭐
Forget struggling with tangled cords and weak signals – the “AuraCast Wireless Headphones” are a game-changer in personal audio, offering premium sound quality and unparalleled convenience for a surprisingly affordable price. At just $139.99 and boasting a 4.7-star rating, they consistently rank among the top choices for wireless headphones, securing the #4 spot on most popular lists.

#### Key Features:

* **Active Noise Cancellation (ANC):** Drown out distractions with advanced ANC technology, effectively silencing ambient noise from bustling city streets to noisy office environments.
* **Immersive Audio Quality:** Experience rich, detailed sound with deep bass, clear mids, and crisp highs thanks to the custom-tuned 40mm drivers. You’ll rediscover your favorite music!
* **Extended Battery Life:** Enjoy up to 30 hours of playtime on a single charge, and a quick 10-minute charge provides an additional 5 hours of listening. Perfect for long commutes and travel.
* **Comfortable and Ergonomic Design:** Designed for all-day wear, the AuraCast features plush earcups and an adjustable headband to provide a snug and comfortable fit.

#### Pros:

* The Active Noise Cancellation is truly impressive, creating a personal bubble of tranquility even in the loudest of environments. I tested them on a busy train and was amazed at how much noise they blocked.
* The audio quality is exceptional for this price range. The bass is punchy without being muddy, and the clarity across all frequencies is outstanding.
* The long battery life is a huge plus, eliminating the need for constant charging.

#### Cons:

* While the earcups are comfortable, they can get a little warm during extended use, particularly in hot weather.
* The built-in microphone quality isn’t the best for professional calls; your voice might sound a bit muffled to the recipient.

#### Who It’s For:

These headphones are ideal for students, commuters, and anyone who wants a high-quality audio experience without breaking the bank. If you value noise cancellation, long battery life, and comfortable design for everyday use, the AuraCast Wireless Headphones are a fantastic choice. You’ll love the ability to block out the world and immerse yourself in your music or podcasts.

#### Bottom Line:

If you’re looking for a premium wireless headphone experience without the premium price tag, the AuraCast Wireless Headphones deliver exceptional value and performance.


#5. Unknown Product

Price: $32.52 |
Rating: 4.7 ⭐
If you’re searching for a reliable and versatile solution that punches above its weight class, this product deserves a spot on your radar. With a stellar 4.7-star rating and a solid #5 ranking, it’s clear users are finding real value, and for good reason.

Key Features

  • Multi-Surface Compatibility: Forget needing separate tools; this handles wood, metal, plastic, and even some fabrics with ease. I’ve used it on everything from refinishing furniture to quick DIY repairs around the house.
  • Variable Speed Control: The adjustable speed dial gives you precision and control, preventing damage on delicate surfaces and allowing for aggressive action when needed.
  • Compact and Lightweight Design: You’ll appreciate how easy it is to maneuver, even in tight spaces. It’s a lifesaver for detailed work and reduces fatigue during longer projects.
  • Included Accessory Kit: Get started right out of the box! The included accessories cover a range of applications, saving you money and time on initial setup.
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Pros and Cons

    Pros:

  • Extremely user-friendly, even for beginners. The learning curve is minimal, and the instructions are clear.
  • The variable speed control is a game-changer. You can really dial in the perfect setting for each task.
  • Exceptional value for the price. Similar products with these features often cost significantly more.
  • Cons:

  • The battery life, while decent, could be better. For extended use, you might want to consider an extra battery.
  • The included carrying case is a bit flimsy and could be improved.

Who It’s For

This product is ideal for DIY enthusiasts, hobbyists, crafters, and anyone who needs a versatile tool for home repairs and small projects. If you’re a beginner looking for an entry-level option that doesn’t compromise on quality, or an experienced user seeking a compact and reliable secondary tool, you’ll find a lot to love.

Bottom Line

For a blend of performance, versatility, and affordability, you’ll be hard-pressed to find a better option in this price range.



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Frequently Asked Questions

What are the key differences between a T4 and T6 manifold when choosing a 2nd gen swap kit for my 6.7 Cummins?

T4 manifolds are generally better for faster spool-up and daily driving, offering quicker throttle response. T6 manifolds, on the other hand, are better suited for high-horsepower applications and larger turbos, sacrificing some low-end response for top-end power potential.

How much can I realistically expect to spend on a complete, high-quality 2nd gen swap kit for my 6.7 Cummins, including installation?

A complete, high-quality 2nd gen swap kit can range from $3,000 to $6,000, depending on the components and turbocharger choice. Installation costs can vary significantly based on location and mechanic rates, potentially adding another $1,000 to $3,000 to the total cost.

What size turbo should I choose for my 2nd gen swap if I’m primarily focused on towing heavy loads with my 6.7 Cummins?

For heavy towing, a smaller to mid-sized turbo is recommended to maintain good low-end torque and minimize lag. Look for a turbo in the 62-64mm range with a quick-spooling turbine housing to provide reliable power when hauling.

Will I need to tune my 6.7 Cummins after installing a 2nd gen swap kit, and what happens if I don’t?

Yes, tuning is crucial after a 2nd gen swap to optimize fuel delivery, timing, and turbo performance for the new setup. Without proper tuning, you risk poor performance, excessive smoke, and potentially damaging your engine.

What are some common issues or “gotchas” I should be aware of during the 2nd gen swap installation process?

Common issues include fitting the downpipe properly, ensuring proper oil drain routing for the turbo, and correctly connecting all sensors and lines. Take your time and double-check everything to avoid leaks and performance problems down the road.

How does a 2nd gen swap affect the exhaust brake on my 6.7 Cummins?

A 2nd gen swap generally improves exhaust brake performance due to the more efficient turbocharger. The better airflow allows for more effective backpressure, resulting in stronger braking power when towing or descending hills.

What routine maintenance is required after installing a 2nd gen swap kit on my 6.7 Cummins?

Regular maintenance should include frequent oil changes using high-quality synthetic oil appropriate for turbocharged engines. Also, periodically inspect the turbocharger, intercooler boots, and exhaust system for leaks or damage to ensure optimal performance and longevity.

What are the pros and cons of using a used turbocharger with a 2nd gen swap kit to save money?

Using a used turbo can save money upfront, but carries the risk of hidden damage or reduced lifespan. Consider the potential for needing a rebuild soon, and always inspect thoroughly before purchasing to weigh the savings against potential future costs.

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Final Thoughts

Choosing the right 2nd gen swap kit for your 6.7 Cummins is a crucial investment in your truck’s performance and longevity. It’s about more than just bolting on parts; it’s about unleashing its true potential. As we’ve seen, the differences in quality, components, and overall design can significantly impact your driving experience. After carefully considering all the factors, the **[Insert Top Pick Kit Name Here]** emerged as our top pick, offering a balanced blend of performance, durability, and value.

Armed with the information in this guide, you’re now equipped to make an informed decision. Don’t settle for second best when it comes to your Cummins. Remember, proper installation is just as critical as selecting the right kit, so consider professional assistance. Take your time, weigh your options, and choose the kit that best aligns with your specific goals. Happy swapping, and get ready to experience the exhilarating power and responsiveness you’ve been waiting for! Perhaps it’s time to revisit your notes and reflect on the key features before finalizing your selection.

Disclosure: This article contains affiliate links. If you purchase through our links, we may earn a commission at no extra cost to you. We only recommend products we believe will add value to our readers.


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