Ive been doing quite a bit of research into this. its down to a 2.6l kb, a twin -turbo setup, or a big single turbo. the motor is a built and stroked 2v with a p1sc-2 on it right now. car makes 537 rwhp/445 rwtq. im kind of leaning to the 2.6kb, because I like the full boost from about 2000rpm's and up and i also like the fact i can save some money by not having to switch to a k-member not that that is a deal breaker though.the main reason i want to go turbo is to get close to that 4-digit rear wheel hp number. but then i started thinking there's always gonna be someone out there faster than meand how much hp do you really need. so I think its gonna be the 2.6 just wanted some opinions from others, thanks for your time.