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Description
Flowmaster Flow FX Direct Fit Muffler - 718155Fits 20 26 GM 2500HD 3500HD 6. 6L Gas Engine FFX Direct Fit Muffler Exhaust System, 409 stainless steel Part Number: 718155 Flowmaster's Flow FX Direct Fit Muffler exhaust system for the 2020 2026 GM 2500HD and 3500HD trucks with the 6. 6L gas engines gives you a great value packed way to help you customize your GM truck to your personality. This performance muffler system fits both 2 4 Wheel drive models and is manufactured from 409 stainless steel
Fits 20-26 GM 2500HD/3500HD 6.6L Gas Engine FFX Direct Fit Muffler Exhaust System, 409 stainless steelPart Number: 718155
Flowmaster's® Flow FX Direct-Fit Muffler exhaust system for the 2020-2026 GM 2500HD and 3500HD trucks with the 6.6L gas engines gives you a great value packed way to help you customize your GM truck to your personality. This performance muffler system fits both 2/4 Wheel drive models and is manufactured from 409 stainless steel for years of trouble-free service and performance. Features include a 3.50-inch inlet pipe leading into a 409 stainless steel Flow FX series "straight-through" muffler for great sound and maximum performance and no drone. The muffler then connects to the factory tailpipe for a simple and effective performance upgrade. Max dyno gains of 7 hp and 5 lb-ft at the rear wheels. This results in better acceleration and towing performance. The system uses all the factory hanger locations and connections for an easy installation that you can do at home. Kits include installation instructions and all necessary hardware. Backed by Flowmaster's Lifetime Limited Warranty.
Features and Benefits
• 3.5-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
• Kit includes complete hardware and factory styled hangers in the stock locations for an easy installation
• A tuned Flow FX style muffler delivers a deep, aggressive to moderate performance tone and improves exhaust flow with no drone
• Max increases of up to 7 hp and 5 lb-ft over the stock exhaust at the wheels
• Tuned performance muffler eliminates interior drone
• Maintains factory warranty
• Lifetime Limited Warranty
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.6 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
great product
great product
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Reviewed in the United States on August 27, 2025
★★★★★ 5
Wind spinners
They always turn out great !
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Reviewed in the United States on August 12, 2025
★★★★★ 5
Great quality
this is one of the best wind spinner I have worked with
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Reviewed in the United States on May 22, 2025
★★★★★ 5
Great sublimation
Sublimate great!
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Reviewed in the United States on June 19, 2025
★★★★★ 5
Used to be great, now not so much
Size: 8 Inch
**update** TOP NOTCH customer service. Seller messaged me very quickly after the 3 star review and was very concerned that their product wasn't as expected - made it right for me and I will definitely give them another try!
I have purchased these several times, and at first I would have given a 5 star. I love the way the come individually wrapped and they use to come with a protective film on it. They still come individually wrapped, and no protective film now. Only 1 side sublimates very well (great colors). The 2nd side is duller and it's noticeable. I will be looking for a new supplier unfortunately. I wish that I could say I still loved them, but something changed!
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Reviewed in the United States on May 17, 2026