I have a '14 R/T, just did the exhaust yesterday, I couldn't believe the difference after this. $400, two 40 series flowmasters and removed the resonators with straight pipes back there. I was a tad worried about the droning, but it's really not bad at all because the sit towards the back of the car, plus I have my flowmasters underneath me in my Duster so I'm probably used to the noise a bit. Along with the sound improvements there are NOTICEABLE throttle response improvements. Best $400 I've spent in a while. I'll be posting video in the next few days when the wind dies down outside.