It has a pruge kit on it. So atleast up to the n20 soleniod is clear. I didnt want to spend hours trying to change the plugs in that thing. In a few weeks he is going to mike ward to have cam, LT's, and o/r Y-pipe with tune done. Also, it says not to put the nozzle before the MAF, but I have seen a few people do it on these cars. Would that make a difference to change it.