I have a 2010 RT 6 speed,had resonators at back removed yesterday for $90, they did a great job even put the adjustable bells back on for the chrome tips. This thing is really loud now, surprized me. The muffler shop said theses were mufflers and the resonators were the ones up front? Felt a diference in power tho hope it doesn't hurt my gas milage, awesome milage from this thing 25-27 on flat freeway.