I am still stock but know a number of people that have gotten Chipped & Pulley'd and have the before & after dyno's to show the gains. I have also seen dyno runs with just the pulley's and there is a significant difference between the two.

I will probably go ahead and get the pulley's & ECU sometime in the next couple of months. Neither Evo nor ASP are on my list. Currently the two options I would consider are RENNtech and Kleeman. If I were to see the ASP pulley in person I may change my mind but I have heard mixed things about it.