acourding to mike kojmi or whatever his name is 15psi is safe but I blew up my b16 on 13psi but with no tune no bypass valve and I took it past the speed limiter at 120mph. SO i think it wouldve been fine had i not took it past 120 which i think the map sensor was so confused (it cant read past 10psi i think) that it let the car keep going and around 135 it just stopped running, it turned out to be broken ring lands. But i would say the tune should be fine if you have the same kinda of motor. Im sure someone will bash me for saying this but this came from experiance so. Yeah and ebay turbo kits are shitty as hell i found that from experiance also. if its a ebay kit which it sounds like it is dont do it. The turbo seals started to leak on me within a month and the wastegate doesnt control boost worth a crap, the diaphram is all bent up and squished. But damn feeling boost is so lovely. I would say just clean out all the oil in your charge piping frequently, dont go above 120 or whatever your limit is, and dont over boost get a good boost gauge.