Okay im itchin to put the full OBX ehxaust i got but i remember a while back i spoke with someone from IPD saying its possible i would throw codes with the down pipe on and not having a car properly tuned up for it. Does anyone know if this could cause any issues. Im not doubting IPD i just heard from various people that it wont cause a problem and i dont wanna find out the hard way. so basically what im asking is does anyone know or have experienced any problems with installing a 3" downpipe and the test pipe with out having their ECU tuned yet. (it might take a while seeing as i lost my job and im broke and fresh outa college)