I just got a 17 Challenger R/T STP the other day and I love it (Still <300 miles). I was not expecting the exhaust to impress me because I've heard hundreds of stock R/Ts. I could not believe how deep and throaty it sounded when I had someone else start it up and rev it. I looked online and discovered the 2017 and up 5.7L Hemis come with active 2.75 in. exhausts like the 2015+ 6.4L. I have not tested it but I read that if you engage sport mode the exhaust will stay open during normal driving. I am so happy with the sound I just had to share it on this forum. I may consider leaving the exhaust stock now. I will try to get more videos posted as the week progresses.