Oh also i forgot to ask... Would you recommend the 5th sub injector or do not think he'll need it ? i dunno what the yield will be on the HP but Im guessing 300-maybe 400 if hes lucky ! and im unsure about the injector, some people say yes some say no ! he has the greddy RC injectors i think 440 or 550 i cant remember, but i think with the ability the manipulate the pulse and width of the injectors you could tune it well enough not to need a 5th injector. Your the master at it ! so you tell me, i need to know before i go and wire up the harness for a 5th injector ! and basicly i dont wanna because its a bitch lol !!