Quote:
Originally Posted by stangcharger
my friends bullitt gained alot mroe than that. went from 240rwhp to 250rwhp by adding a SLP catback.
2-3rwhp seems low to me on a GT for a catback exhaust. maybe a v6 mustang.
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That I believe. SLP is a straight through muffler just like Borla and Magnaflow. Stock mufflers, Flowmaster, and Mac are chambered mufflers. A straight through muffler flows better and will show better gains than a chambered. People get chambered mufflers to have that muscle car sound, but they will only give you a few rwhp over stock. My buddies SS Camaro gained 20rwhp by going from a stock catback to SLP.