If you would like to run Flowmaster Original 40 Series mufflers on your auto R/T, pick up a pair of Flowmaster part #8042443. If you go with Original 40s, be sure to keep your factory resonators in place. This will help you maintain a quieter interior sound level. Don't hesitate to give us a call at 707-544-4761 if you would like more info on any of our other muffler or kit options for your Challenger.OK, Mr Flow master dude...which 40s will work best on my
2013 Challenger Classic, 5.7L, 5speed auto?? I be got preload handled by K&N, now need something for afterload!!