Just an update now that I've put a few hundred miles on with the new exhaust. The fitment is a little tight right where the 2-1 merge is and it exits up from the rear belly, was only a mm away from the pipe, but has since self-clearanced and is not an issue. Many non-Busa riders have been very impressed with the quality of the system, most comment on it being a spring tension setup thinking it would be prone to leaking bad, but it doesn't. Also the sound, unbelievable. I know the lil vid doesn't do it justice. I wanted it a lil deeper and lower than many I've heard and this hits the mark on spot. Simply a marriage of form and function.
GPW, ditto on power difference from stock or previous setup to the Spec II, or overall power tuned of course. Thanks