I am interested in a Thermal R&D Stealth, I was wondering if the gains are pretty decent or good, that will be more buying motivation. Also does anyone know how a Tanabe DTM sounds, there is one on ebay I'm a little interested in. If its real loud then forget it. I like an exhaust that has a pretty quiet idle and cruising, not too annoying, and a nice deep loud roar with acceleration. Cementups said 477 shipped for Thermal in his posts, good price. Any suggestions or advice? Thanks