I have one of these, EVERYONE I know digs the sound of it. The piping does neck down from 2.5". Worried me at first, hasn't seemed to hurt me though. I'll upload a sound clip from a recent trackday, i already have a video on youtube. My tips are sliiightly different, but other than that, everything looks identical down to the HKS badge. I've been happy with it, i know it's tough to choose w/o soundclips though.
YouTube - Garage: Laverty Project Elise- Exhaust!
YouTube - PGP Trackday 9/24/09: Part 2- The Sloppy