I had a turbo RSX-S. My first kit I had on was a Greddy Kit and made 261WHP. Very reliable and simple. My second kit I had made 421WHP and I ended up blowing up the motor due to failure of the oil pump, I got very unlucky. A stock k20a2 can handle powers up to and around 500WHP. I've heard someone making 600WHP on a bone stock motor but I'm not too sure if anything happened to the motor or not. Boosting a K20 is a lot of fun, but they have weak rods and oil pumps.