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2008 GMC Sierra Performance Mufflers

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Latest Customer Reviews

Flowmaster 70 Series Big Block II Mufflers Reviews


Flow master 70 series

Reviewed By Jeffrey S (Warsaw, MO) Reviewed for a 2008 GMC Sierra —11/10/2016 3:22 AM

I purchased this muffler to replace a smaller flowmaster muffler that was too loud for my application. This has the performance of the flowmaster technology without all the noise.

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Flowmaster Super 40 Series Mufflers Reviews


Super 40

Reviewed By Alex H (Wichita, KS) Reviewed for a 2008 GMC Sierra —5/3/2012 8:05 AM

It's not as loud as I thought but that's what I wanted on my 08 Sierra with the 5.3. Has a solid rumble but not to much! Much better than the 50 series SUV! Overall very happy with the product! Can't go wrong with the Super 40

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Flowmaster 40 Series Delta Flow Mufflers Reviews


40 series delta flow on a 2008 Gmc Sierra 5.3

Reviewed By Gary A (Alden, MI) Reviewed for a 2008 GMC Sierra —5/1/2010 6:22 AM

Sound level and tone from the exterior are perfect. Inside I have a bit of a harmonic drone around 1700 -1900 rpm range that is a bit too loud otherwise interior noise levels are about what I expected. This is my 3rd Flowmaster on as many trucks I'm sure it won't be my last.

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