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I just purchased the HPF downpipe, and I'm sticking with the stock cat-back for now. Anyone know/dyno how many horses can be gained from going from aftermarket dp w/ stock exhaust to aftermarket dp w/ straight through exhaust. If it isn't that much, I think I'll just stick with the stock exhaust for a more sleeper look and sound and just unbolt it at the track.
 
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Hi...

It is very restrictive.

I had a stainless steel exhaust made up with 3" tubing with a stock looking tip. It was recently tested at 89 decibels, not loud but sound aggressive on full throttle.
 
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