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GMC Flowmaster Exhaust, Mufflers & Tips

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Latest Customer Reviews

Flowmaster Exhaust Systems Reviews


John from Highland MI

Reviewed By John F (MILFORD, MI) Reviewed for a 2004 GMC Yukon XL —5/21/2018 10:34 PM

I ordered a Force II system to ensure a cat back compatible system. The system consisted of a resonator pipe, muffler, and tail pipe, all 3 in. diameter. Assembly was very straight forward with the parts all fitting nicely together. As a senior citizen working alone on the ground with the truck backed up on auto ramps, it probably took me about 4 hours. Most people could probably do it in two hours or less. The system is quieter than I expected but should be pretty efficient.

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Flowmaster Direct-Fit Catalytic Converters (50-State Legal) Reviews


Passing smog

Reviewed By Martin P (GALT, CA) Reviewed for a 1995 GMC Sierra —6/12/2017 3:31 AM

Sweetness

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Flowmaster Street Performance Mufflers Reviews


Sounds great!!!!! 40 series

Reviewed By charles t (FOUR OAKS, NC) Reviewed for a 2014 GMC Sierra —4/15/2015 8:59 AM

Muffler sounds great when added with a k&n 77 air intake. Just remember new sierras and silverados, need to have the exhaust adaptive valve locked in full open position for full effect. Spring loaded valve damper inside pipe 6 inches after factory muffler. There to keep down sound when in v4. Does not effect performance of vehicle. Also remove the resonator. Worth the investment!!!!

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