Forgot to add Mopar Exhaust. Story i got from Chrysler was that it was the president of Mopar's car, it went through the R&D department and they put everything they had on it. Originally came with a laptop tune, the dealer "updated" my computer and lost the tune (ran like crap), after much back and forth, Chrysler sent it to a local speed shop (Sheradon Performance) to be tuned. Predator tuner has 3 or 4 tunes on it. I've never played around with that.