I have it and its rad! Hella Loud at WOT, but I installed a resonator to help with the low end noise. Performance was very noticeable. Dyno numbers and mods are in my sig. As far as installation...a total BITCH! It was the hardest thing I've ever installed on the car! But very worth it!
The system mentioned above will provide best results in the upper RPM range or lets say at Wide Open Throttle. Ive used wide open race systems but dont find them good for daily driving as I dont constantly run at WOT. I like the gains I get from the flowmaster system which is a 2" pipe. It is tuned for low and mid power and unless your fullout WOT racing low & mid is the most useable powerband. If you like driving through the twisties or auto-cross type racing where you want power and low end torque pulling out of turns go with the Flowmaster. If all your doing is dragracing at WOT go with the 2.25-3" straight through type.