Quote:
Originally Posted by BackinBlackSS/RS
I had Flowmaster Super 40's on my 06 GTO. Sound was awesome. For those of you that think you lose power with Flowmasters, well I gained, proven on dyno before and after. All I did was a muffler swap with the originals. Under $175 installed.  |
Of course you are going to gain power. You swapped them out with stock. To make the amount of sound and resonance they are so famous for, it takes alot of internal channels/passages in those chambers. Which equals restriction. Cut one open, see what I mean.
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