My setup is all stock with the exception of a 70 millimeter turbo 7/8 pounds of boost. I have been taking it to a shop to be tuned three times now and the vehicle is getting worse and worse. It is now backfiring through the throttle body if I install the Boost pipe... Can someone help with a tune... I am considering buying the software package, if HP Tuners can rectify this. Thanks
Note:The shop is using HP tuners to tune the vehicle.