That part is still stock. The shop I am working with are going to start building cup like street legal exhausts, and will be using mine as a bench mark/tuning car. The results were quite good for stock exhaust/intake/software. I have no doubt that this car will accelerate quicker then a c2s that use to hang around in my garage.

 

depends of a dyno but i think it was supposed to be closer to 405?

 

You are correct, the type of dyno can make a difference, in this case it was done on a Dynapack. I can tell you my buddies 3.9SW was pulling 420 on this machine, so I am not feeling too bad. They bolted a cup exhaust on my car, and squeaked out another 17hp (peak gain), there was a huge dip in the middle of the graph, and they said with the correct software it would smooth things out.