Runs like a dream as far as u know. lol. if u want a good out of the mail tune, look more towards: INTENSE, DHP, Will at Overkill Performance. I myself have a ZZP PCM but am doing a whole different tune with it because i have HPTuners. If your experienced with tuning go that route. But if not look at those other companies for mail order tunes. Trust me people will definetly be chiming in after they read u have a ZZP PCM. I can already fore-see Bluegtp91 posting after he reads your post. lol and many at that. Do yourself a favor and get a different PCM and slap them rockers and headers on and call it a day. if u dont mind me askin what kind of hearders and rockers u goin with?