300C, Magnum RT & Charger RT (5.7L V8)
hey all, i just have a question about my 2005 magnum r/t. it has the SLP loudmouth 1 catback, in the summertime i got a diablosport predator and put in the 91 octane set tune, with some modified parameters. before i got the tune my car would make a gurgle sound when it upshifted, especially at...