Hey CX-SV, do you recall the forum member who was testing the CS exhaust sold it in the classifieds?
http://www.mazdas247.com/forum/showthread.php?123821677-Corksport-CX-5-Exhaust
It didn't pass the wife-test for him, which spoke volumes to me. That said, I still want to hear an audio clip or see a video with the CS exhaust on.
Yes, I do remember that. I also assume that was a pre-production prototype.