Guys just reading this thread, I'm a little confused what the surprise is about with motors blowing up (350+rwkw) with / without the Nizpro plenum involved with standard internals. Personally I think its one of best kits on the market, and Simon's design wasnt born yesterday. The design has been and is still currently used in some of the fastest VL turbos / Skylines etc in the country, so the straight though front throttle body system has been going for so many years now. For the psi vs power output I havent really seen anything dramatically better. However Nizpro has always stated that their stage 2 kit properly tuned the max they are willing to go is 340rwkw, anything over this (with standard XR6T motor internals) its a timebomb. Thought I'll add my 2 c