i just bought an 04 white sti with 54k miles on it,i know not one thing about it all i know is that its APS tuned meaning like bigger turbo, big intercooler in front bumper uhm fuel injectors ,fuel pump, Aps turbo back exhaust, so many things i dont even know, i was gona ask u guys where i keep the c dif. at like top or bottom actually i dont even know what that does? same with this thing by the fuel DC something what is that also? thanks guys srry ima noobie...