Originally Posted by F.I. Inc.

2.5" will be more than enough to about 525-550 RWH. Now, you can make more with the 2.5" but it becomes restrictive at that point. You have to be careful in regaurds to a S/C with the exhaust. Bigger is not always better. The supercharger will need back pressure unlike turbos which need no back pressure but trust me when I tell you this, our exhaust with a supercharger will outperform any other 2.5" cat back on the market.

I would bet the farm on it.