[mlambrecht82]

I would go with the Steeda Tri ax instead of the Pro 5.0. The majority of people here seem to agree with me. I think that you can get it on sale right now at www.steeda.com click on specials. As far as exhaust, something that will make the guy next to you feel the rumble will drive you crazy driving around town, go with electronic exhaust cut outs, you car will go from stock to shaking everything within a matter of seconds.
go to:
http://www.quicktimeperformance.com/
They have a complete setup for $309 includes exhaust cut outs. All you have to do is wire it up and weld them into place.
You can see a video on my site of what it sounds like, the quality isn't to good though. One video is with out the supercharger with magnaflow mufflers and 2 cats removed. The second video is w/ the supercharger and BBK LT headers and High flow cats with exhaust cut outs. So if you dont change your headers or H pipe it will be a little bit quieter.
http://mustangmadness.hypermart.net
click on the videos section.