Oh yeah, almost forgot. Two years ago at Laguna Seca I was having trouble passing the 104db sound limits with the side exhaust. So last year I put together a Laguna Seca specific exhaust; entirely different config with downpipes going down the center tunnel and merging just behind the transmission, then 3″ all the way out back, small resonator in the tunnel and then the largest Magnaflow muffler I could find under the trunk space. I didn’t end up going to Laguna Seca last year so I never got a chance to use it.
Always improving:
Local autocross is a strict 91 db limit, and with Miata Reunion right around the corner it was a good opportunity to make sure this exhaust was doing the job. No issues during the autocross. I daresay I could probably even run this car on a normal 92db sound limit day up there!
This config is obviously much heavier than the usual side exits, so those will be back for GTA Finals at Buttonwillow.