I know guys that are running 500-550HP reliably on the stock evo motor. I wouldn't advise over 500HP though. I hear it's a MUCH lower number for the sti motor befor eneeding to be beefed up. And it will cost you a lot more.
Yeah the 9's are making some good noise. The mivec looks to be a good addition, as well as the biger turbo.
Yeah the 9's are making some good noise. The mivec looks to be a good addition, as well as the biger turbo.