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2011 GMC Sierra Performance Mufflers

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Latest Customer Reviews

Flowmaster Super 44 Series Mufflers Reviews

What Did You Say?!

Reviewed By Joseph N (CLINTON, ME) Reviewed for a 2011 GMC Sierra —9/21/2016 8:13 PM

My ears are bleeding.... I love it. For real though, it's a little louder in the cab than I wanted, but I'm glad I didn't go with the Super 10. Good price, gotta love AutoAnything. Had it welded, only way you should do it really, and appearance I could care less about because no one is going to be looker underneath my truck.

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Flowmaster 40 Series Delta Flow Mufflers Reviews

Love it

Reviewed By Ray R (WESTERVILLE, OH) Reviewed for a 2011 GMC Sierra —7/2/2013 10:48 AM

I had a local shop cut the stock muffler on my 2011 GMC Sierra and had this installed. I paid 70 to have it welded on the stock exhaust pipe and could not be happier. if you have my truck you will need the 3" center inlet with 3" offset outlet. There is some resonance inside the cab but nothing crazy that will disturb your conversation or phone calls. could not be happier with the delta flow.

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Flowmaster 50 Series HD Mufflers Reviews

Flowmaster 50 series muffler 2011 GMC 6.2

Reviewed By DAVID H (West Mifflin, PA) Reviewed for a 2011 GMC Sierra —12/17/2011 1:53 PM

Installed this muffler in place of the factory muffler. The sound is awesome, not too loud, but you know its on there.

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