I have a CAI, long tube headers, high flow cats and corsa cat back system. I paid for a dyno and "performance tune" from a shop in Northwest Houston. What I received was a check engine light and 8 to 10 return trips without resolving the problem. I now hear these guys are good with Mustangs, but not that experienced with Chargers. I need to get the car "re-tuned". Anyone have any suggestions?