I am running MS1 v3 with wickedesi's board mods and the fairchild alternatives to the vb921. My buddy John (aka J. panther) has been running MS on his boosted mx3 for a while now and is very confident in his tuning skills. We took the car out to do some street tuning. I have the wastegate set to 10 psi. After about 3 hours of driving around my car finally feels like a factory turbo car.... If not better! I wanted to be on the safe side so we stuck with low 11 AFRs and about 19 timing @ WOT. The car moves out for being on 10 psi! I was very impressed and pleased with the tune. I drove about 2 days on this tune (full and p[art throttle). Well I hop in my car to go to work today and all is well.... car still pulls like a train. I go through my work day and start heading home.... I decided to do a boost pull on my street and the car started breaking up as soon as I hit 10 psi.... I took a look @ the wideband and wot was lean (15.7 afr). I had this same issue happen to me once before and It was the open loop settings. My overboost protection is around 17 psi. NOTHING HAS CHANGED SINCE THE TUNE! I havent hooked my laptop back up to the MS since my boy tuned it. BTW the car is full built w/ a gt3076r. LMK what you guys think.... I will post up a my MSQ if one of you guys would like to look @ it. Thanks in advance