even the real ssac's haver issues that have to be fixed. my rear o2 is pushed into my body of the car. which is causing i notacble vibration when i start and drive. i think only weay to fix it is to cut the peice and twist it. oh and the damn ubend in the ssac's i didnt have tme to fix mine last night. and it drags over any little bump i have in my yard lol. if i was to run with no rear o2 till i got it tuned what would happen?