AFE Large Bore-HD 4" 409 Stainless Steel DPF-Back Exhaust System 20-25 GM 6.6L Duramax
SKU: 52512523351

AFE Large Bore-HD 4" 409 Stainless Steel DPF-Back Exhaust System 20-25 GM 6.6L Duramax

$327.24 $363.60
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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13

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Description

AFE Large Bore-HD 4" 409 Stainless Steel DPF-Back Exhaust System 20-25 GM 6.6L DuramaxDont hide the power of your engine behind a basic exhaust, upgrade to an exhaust that results in increased horsepower, improved throttle response, hassle free installation, and durable construction. What exhaust is this? Well, its aFes Large Bore HD 4 409 Stainless Steel DPF Back Exhaust, specially made for your Duramax. What are the benefits? Reliability and durability, which will save you time and money in the long run by avoiding replacing your

Don’t hide the power of your engine behind a basic exhaust, upgrade to an exhaust that results in increased horsepower, improved throttle response, hassle free installation, and durable construction. What exhaust is this? Well, its aFe’s Large Bore-HD 4” 409 Stainless Steel DPF-Back Exhaust, specially made for your Duramax. What are the benefits? Reliability and durability, which will save you time and money in the long run by avoiding replacing your exhaust system. Not only that, but you can fly down the road in your truck with increased horsepower! What else is there to offer?

4" 409 Stainless Steel Construction:

This DPF-back exhaust system is constructed of 4" mandrel-bent 409 stainless steel tubing for maximum strength and durability.

Dual 5" Diameter Polished or Black Intercooled Exhaust Tips:

Finishing off this exhaust system are dual 5" diameter polished or black 304 stainless steel intercooled clamp-on exhaust tips. The tips features an aFe POWER logo plate riveted on for a unique style.

Installation:

Some cutting will be required, see instruction sheet for further information. Utilizing factory style hangers this system mounts directly to factory mounting locations for a hassle-free installation.

Integrated Mitered Merge Collector:

A mitered merge collector is used to decrease turbulence and increase exhaust velocity resulting in increased horsepower, torque and improved throttle response.

Computer-Aided Design:

Utilizing state-of-the-art computer-aided design technology, this exhaust system is designed for custom, high tolerance factory fitment.

MIG-Welded:

100% MIG-Welded for race-proven strength and durability.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 52512523351

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Ray
Omaha, US
★★★★★ 5
Helps fixing small engines
Size: 2 fl oz
⭐⭐⭐⭐⭐⭐⭐
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
J
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JustAGeek
Massapequa, US
★★★★★ 5
It works like magic, saved me $150.
Size: 2 fl oz
I filled 1/4 tank of gas into my snowblower which I could not started, sprayed about 15 seconds of Start Your Engines, rock snowblower to mix well, let it sat for an hour. I pulled string and yet couldn't start engine. Unscrewed spark plug and spray some into cylinder, put the spark plug back and pull the string. ENGINE STARTED!!! SAVED ME AT THE LEAST $150.
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Reviewed in the United States on March 1, 2026
B
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Bear
Alexandria, US
★★★★★ 5
Great
Size: 2 fl oz
Great
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Reviewed in the United States on May 22, 2026
B
Verified Purchase
Brandonian
Cuba, US
★★★★★ 1
Flimsy Nozzle
Size: 2 fl oz
The nozzle is so flimsy at the moment I pressed on it it popped off the can into the gas tank. I didn’t press it softly but I also didn’t press it very hard either, getting it out was a huge pain in the butt.
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Reviewed in the United States on May 24, 2026
J
Verified Purchase
Jesse S.
Pawtucket, US
★★★★★ 5
The Ultimate Multi-Use Motor Treatment – A Must-Have for Any Vehicle!
Color: Pack of 4
The Sea Foam SF-16 Motor Treatment is an outstanding product that truly delivers on its promises. After using it in multiple applications for my vehicles, I’m convinced this is a must-have for anyone looking to maintain and enhance engine performance. The 4-pack is an excellent value and ensures I always have some on hand for routine maintenance. Why Sea Foam Stands Out Multi-Use Versatility: This product is a game-changer! I’ve used it as a fuel additive, an oil treatment, and even to clean out stubborn deposits in my carburetor. It works flawlessly across applications, making it an all-in-one solution for keeping engines running smoothly. Improved Performance: After adding Sea Foam to my fuel tank, I noticed a significant improvement in my vehicle’s fuel efficiency and a smoother idle. It’s particularly effective at removing deposits and buildup that can reduce performance over time. Easy to Use: The instructions are straightforward, whether you’re using it for fuel, oil, or cleaning purposes. The precise measuring cap ensures no mess or guesswork, making it simple to get the correct dosage every time. Great for Long-Term Maintenance: Regular use of Sea Foam has made a noticeable difference in prolonging the life of my engine. I’ve also used it to revive an older lawnmower engine, which now runs like new! This product pays for itself by preventing costly repairs. Packaging and Value The 4-pack is perfect for multi-vehicle households or anyone maintaining more than just a car. I’ve used it in my truck, car, and small engines like my generator and lawn equipment, and I still have plenty left. Pro Tips Add Sea Foam to your fuel before a long drive to maximize its cleaning effect. Use it regularly in oil changes to keep sludge buildup at bay. It’s also great for seasonal storage—just add it to your gas tank to stabilize fuel and protect the engine. Final Thoughts Sea Foam SF-16 is the real deal for anyone who values vehicle performance and longevity. Its multi-use functionality, ease of application, and proven results make it a standout product. I’ve already seen noticeable improvements in my vehicles and equipment, and I’ll continue to use it as a staple in my maintenance routine. Highly recommend it to anyone who takes pride in keeping their engines in top shape! Pro Tip: Whether you’re a DIY mechanic or just looking for a reliable maintenance product, Sea Foam is a must-have. It’s one of the simplest and most effective ways to protect your investment and extend the life of your engine. Don’t hesitate—this 4-pack is worth every penny!
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Reviewed in the United States on January 12, 2025

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