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Discussion Starter · #1 ·
I just put a Flowmaster Super 40 on my 07 Silverado 4.8... It sounds sick and it did increase the HP, but I was wondering if anyone knows how much HP it actually adds?
 

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was it a whole system? if it was a whole cat back than that prob 10-15 but if its just a muffler maybe 5
 

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Discussion Starter · #5 ·
yeah, it's just the muffler for now...until im ready to get my dual cat-back system set up:great:
 
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