please tell me you have havent chipped your car. I dont know who/what garret is as far as tuning software, unless you mean turbo software(as in software for a bigger turbo) and i dont think garret does tuning, they just make turbos...but anyways, doing what you did is a no no as far as im concerned. Pretty much, you just bypassed chipping your car, so you have higher boost, but you have no tuning for it. What i suggest you do, is get chipped, i recommend APR, GIAC, or REVO, anything else isnt really that amazing....but after getting chipped, just leave your MBC alone for a while. Its really only worth it once you go big turbo...otherwise, youre gonna run into limp modes and such. what other mods does your car have?