one thing to take into consideration is what octane of fuel your running. if your using 93-94 then you sould be able to get away with a higher boost level and by high i mean like 8-9psi. but lower octane like 91 will be even less. but an upgraded fuel pump alone should let you boost to around 15-18psi pretty safe. just as long as you keep an eye on the EGT's you sould be fine. correct me if i'm wrong on any of these guys but that's what i've always been told and read.