Quote:
Originally Posted by Cheesehead
Just installed Fast Intentions cat backs with 12" resonators. Nice growl, supposed to bump HP aprox+15
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I also have the Fast Intention W/o RES and it does add a great grumble to it
suggest OP looks it up
However that 15HP is not usually accurate.. those are numbers that could mean hundreds of different things to a manufacturer trying to sell there product.