just got an apexi avfc-r.i was just wondering what you all think would be a safe boost level 4 my gsr. the kit i got is pretty basic(no injectors or anything just an fmu). I know this subjust must have been posted befor but couldent find it, sorry if it was!

 

yes try the search button before posting next time, but without fuel upgrades i'd say about 7-8 psi max on a stock block