Well I actually had the ACM mod before paired with my test pipes and it was a bit too much as it was serving as a DD.(
Video of a tunnel run here) Having gotten a new DD, it sees limited use and I think that, although its pretty darn loud, the pairing is the best tone to me.
The IPE is really nice all around– it's quiet around the neighborhood, doesn't drone and starts getting aggressive when you really start getting on it. Almost has a snarl to it when you put it under load over 4.5k RPM or so. I have a video of it on my insta from a track day if anyone is curious to hear it, username jonvlasach