I installed the Remus DP with 200 cell HJS cat (thanks
mike@x-ph.com for a terrific holiday deal). I'm running with the stock catback, and the only other mod is the Dinan Sport Tuner (soon to be replaced with BM3). First, the sound upgrade is fantastic - just a thrilling noise as it climbs in the revs under heavy throttle. Car also feels like it revs more freely and there is a small, but definitely noticeable, power bump.
Remus fitment was spot on, and power with the Sport Tuner is all I need for the street.