Hey guys, i have an 040 in my r33 Racecar, i was running one of these in my road car with no drammas, but i am getting a miss from 4500 rmp on, when the throttle is wide open... i have replace the TPS, new splitfires and still i have this problem, i am running std ECU & STD boost while i have this problem, the car is fitted with a front mount and other than that & a 4" exhaust from the turbo, it is dead stock, (splitfire & irrideon plugs). anyway my question is should i be running a fuel pressure reg? is it possible to be supplying too much pressure? i don't tyhink so, but i am buying some new s15 480cc injectors this week, maybe the old injectors are the problem... i don't know as the car only just arrived from japan a few weeks ago