it could go to 20psi for a second or so neways even if unchipped

be careful


i went thru all my ecu's and just ran em up to see what teh car would pull but you have to get it running higher boost for 5 secs at least really so you know it really was accepting that pressure, could also have a hole in the vac port or summet too, shud only have run the same boost that it was set to on the other ecu too really unless you upped the boost while you changed em