i believe almost all the exhaust promise about the same power 15-20hp. if you ask here everyone will tell you to get FI... the person that provided that sound clip data base, click on it and listen to which one you like the most and get that one.
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2 plus 2 times 2 = ? ... hint, it's not 8 
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq
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