This years sled 2021 850 162 belt drive, mtntk turbo kit, kurts gear down, power claw 3 inch track, powder freaks drivers, mtntk antistab, slp intake vents, autometer boost gauge, Cracing gauge mount. Powder coated the rails, both bumpers, foot boards, seat hoop, all 4 springs, gauge mount. Running 4 psi pulling Polaris 10-74 grams in the primary with a 150-310 spring at 8600 to 8500 on pump gas. Loaded her up with 10-78 last night leaving today to go ride, im thinking I might have to turn it up to 5psi to pull the 78's at 8400 so will see. MTNTK kit is pull and go like all the rest I have had.