Robert Mumm wrote:This is from the November Fastrack:
SCCA Fastrack News
November 2015
Page 16
Kit G1190523 (including Standard Muffler P/N 390523) is required for all events.
For tracks with stricter sound requirements
Quiet Muffler Kit P.N G1190524 is available as a replacement for that event.
I assume that the Standard Muffler is something new.
I don't have a GEN3 yet, but the CSR at Texas World Speedway last week spent the good part of half a day getting everyone's installed. But there seemed to be some issue where the mounting system wanted to loosen up, so be sure when you get the muffler, tighten it often (like every heat cycle maybe).