I had Apexi Pod, 3.5 " exhaust, FMIC ,HKS 2510 Boosted to 15 psi..These mods unfortunately will not aid in response. Only mid range and top end power. Like it or not RB20DET will never make low end muscle...That being said it was great in cornering and top end power...But it aint gonna run quick times down a drag strip without major clutch abuse