does any one have one of these? I was thinking about having my brother convert my tc one to a water at collage for a project. is it worth it? I want to run around 18-20 #'s of boost and advance the timing a few degrees. there was something on the xr4ti that cought my brother attention about it and he got very excited about it. so would it be worth it with free welding and stuff just paying for the materials? how much do you think that would cost then