I'm running TP's and stock exhaust now and do not like the sound from inside the cabin. My personal preference is a deeper throatier sound. I loved the OEM ACM mod but when I later wanted to add TP's I realized after listenign to other cars with that combo it was TOO loud. I'm putting in a Megan Racing exhaust this week, my friend did it already and it sounds great IMO. I have the BPM tune as well and LOVE it. I edited it, hopefully it took, it was upside down.