*Note - There wasn't a section for the GT trim so I'm posting it here since it has a 3.6L in it. I've had my Challenger for about a year now, and I love it. But I think I wanna do some relatively light modifications to it. The ideas are listed below, feel free to chime in. Exhaust System: I'm looking to upgrade my exhaust. So I have to decide between Cat-back and axel-back. I think most people go for cat-back because it provides more attributes (relatively small as they are). In my research I've read that even though the cat-back is more popular, the axel-back is still a route one can take if the stock exhaust system is open enough already. What do you think is the better route to go? Tuning: I only have a very basic understanding of tuning, and from what I've been reading a tune is good, even if the car is stock. Do you have any suggestions on what brands are good as well as reliable?