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- What Do You Drive?
Style:Dual rear/dual side exit (409 Stainless)
- Super 40 Series Muffler
- 3.5" stainless tips with embossed Flowmaster logo
- Includes extension pipes for installing as a dual-out-rear or dual-out-side system
- Lifetime Limited Warranty
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Flowmaster Exhaust Systems Part #817669 Customer Reviews
23 Customer Reviews
Reviewed by George B (WEST CHESTER, PA) Reviewed for a 2017 Chevy Silverado — Friday at 2:02 AM
I installed the flowmaster American thunder exhaust on my 2017 Silverado all went well, my truck sounds great and i did notice an increase in my gas mileage. The exhaust was easy to install, I opted for the side exit rather than the rear exit.
Reviewed by Gary S (Altura, MN) Reviewed for a 2017 GMC Sierra — Aug 11, 2017 6:07 PM
A great product well made just need to be patient matching tailpipe positions and angles. Recommend you tack weld all joints then fully tighten clamps.
Reviewed by Brian C (GRAND RAPIDS, MI) Reviewed for a 2014 Chevy Silverado — May 05, 2017 3:28 AM
The clamps are not the greatest. Went with aftermarket. The sound is not over bearing at cruising speeds. You definitely notice the rumble when you get on it thou.If you can keep your foot out of it, the MPG'S do go up.
Reviewed by Calvin B (HARTSVILLE, SC) Reviewed for a 2017 Chevy Silverado — May 04, 2017 4:44 AM
The install was fairly easy. However, (as previously stated in other reviews) I had to replace all of the supplied clamps with ones purchased from my local auto parts store and added 2 hangers (approx $35), because the supplied clamps are crap (which evidently they know about but keep including them for whatever reason), and t added 2 hangers near the tailpipes to prevent them from rattling. I have had Flowmaster exhausts on previous vehicles and the sound is good, Get stainless steel.
Reviewed by Mike S (SPRINGFIELD, IL) Reviewed for a 2017 GMC Sierra — Apr 12, 2017 6:23 AM
The exhaust sounds great for my 2017 Sierra. Not too loud and cab noise only gets loud while cruising at 75+ but it's not overbearing. The installation wasn't too bad after I got a cheater bar to tighten the clamps. I also added a tuner super chip which is a must if you want to feel the true power your truck is capable of.
Reviewed by Brian F (WOODBURY, CT) Reviewed for a 2014 Chevy Silverado — Feb 28, 2017 7:28 AM
Exhaust system sounds great and was easy to install. I was disappointed with the clamps that came with it since they did not tighten down enough to hold the pipes in place. For a $750 system everything included should work as intended. I had to go to the auto parts store and purchase 5 cheap clamps as replacements. Other than that I would recommend the system.