Heading to Laguna, lots of homework already done- appreciate the thoughtful work, however.. AWE Switchpath, Grimmspeed's product- these are elegant solutions, but downside is cost and requiring competent install. The_Dead_Cow said : " I pass 96db @ 50' with McMaster high temp plugs in the valved pipes $50" Does anybody have experience with this? It seems cheap and easy. Just unscrew the plug when you finish your track day, right? Any advantage to the electrical/exaust module defeat ? Even clever contributors describe the install as a PITA..Either way, "running quiet" in our cars heats up a valve or a plug, produces some back pressure thus stealing a few ponies, whatever. Thoughts/ Wisdom?