Sorry this is a bit late, I recently got mine installed on my 13' RT about two weeks ago. I decided to go with the qtec66 that you can order off summit racing for 400. I paid about 350 to get them installed since I heard you can really mess up your wiring if you don't know what you're doing. Basically what they do is theres a switch you flip and hold and it which opens two plates that basically shortens your exhaust and makes it a lot louder. You also have the ability to close the plates which returns the car to its quiet original state. IMO definitely worth if you live in a neighborhood or just don't want to have the car loud all the time.
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