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Message: <blockquote data-quote="blown98gt" data-source="post: 826528" data-attributes="member: 11284">6-8 psi reguardless for safety reason you'd want to upgrade to 42lb injectors.. and you will need a tune.. some guys have tried to pull timing and just do that, but this is very risky.. IMHO and I think a few of the guys around here including myself have become knowledgeable on this stuff, with any type of poweradder, not getting a tune is risky. You will need to upgrade your stock injectors but at 375 hp you are looking at 35lb fph (fuel per hour) per injector. So you could run 39lb injectors which with a turbo should be good for around 390hp at 80% duty cycle.. but all in all, don't be cheap just because the kits from on3 don't cost that much, get the tuner and injectors and your motor will live a long time =D</blockquote>