Thanks Justin, I loved the idle, it was just too loud and drony at 80 mph for me. If the Flowmaster cures that, I will try it again. My logs showed me no difference in performance between MBRP and stock exhaust with Cobb S3 tune, so I put stock back on for stealth and comfort.
But stock is harder to drive fast, not quite enough auditory feedback to "hear" shift points on track. I also baffled my symposer so could try reversing that for more audible feedback, but like music around town.
Never made it to track with MBRP but doubt that would be problematic with Flowmaster.