RCC, Velocity and Hahn are all good kits, but remember that you get what you pay for . . . RCC uses stainless steel piping throughout, and has some of the best header pipes you can buy - that is why he warranties the entire kit for two years. Also, even on his Stage One kit, he uses a Tial 38mm external dual-port wastegate, a big plus. Hahn's "log-style" plenum is the subject of many a debate and once you get past that, the biggest weakness with the Hahn is the mild-steel head pipe, which can develop cracks over a period of time. Every one I ever encountered has been replaced free of charge within the first year and they are not unaware of the problem. That is why we offer a stainless-steel replacement for the Hahn that happens to be manufactured for POWERHOUSE by RCC.
For the price, Hahn makes a great Stage One kit. It spools quickly and makes power. If you have a little more $$ to spend, I would recommend that you go with RCC. Bottom line is that regardless of what you have, you get it tuned properly!!:rulez8bn: