Join Date: Mar 2018
Location: Marina del Rey, California
Seems odd that just the outside material would not satisfy compliance requirements, but what do I know about the technical aspects of exhausts. The PO of my 310R installed the steel version (with carbon end piece) that he got from, I think, Revzilla, and I am happily riding around with it, in LA. Don't know if that helps. I do like the look and prefer it over the all-carbon look but that's down to personal taste of course.
2018 G 310 R, 2016 C 650 Sport and 1976 (!) Yamaha XS650