I have a SSI Speed shop titanium muffler off a 2020 MountainCat M8000. Got it new from Black Diamond Xtreme out of Cannon Fall MN. 3.2 pounds, 19 pounds lighter than stock. No tuning required. Used two seasons. Just a little louder than stock, not to bad when wearing a helmet. I'm old and hard of hearing so take that with a gain of salt. Asking $200 plus shipping.