tuefelhunden
07-10-2007, 02:04 PM
If you have the new style GYT-R exhaust for your YFZ450 you can purchase the Curtis Sparks quiet core and it will fit and meet sound requirements. I was tested at the D23 Motowoz race with the "regular quiet" insert and fresh packing and I was 98db. There is also a "extra quiet" available and it will fit.