Carlisle Ultimax 3 has evolved into Ultimax PRO. Thicker cross section so more surface area is in contact with clutch. New cog design dissipates heat and aids flexibility Runs cooler for better performance. Run cool, run long & run fast with Ultimax PRO Additonal Fitment:2005-2005 SKI DOO BRP MXZ X 600 HO SDI2007-2007 SKI DOO BRP MXZ X 600 H.O. SDI2006-2006 SKI DOO BRP GSX LIMITED 2-TEC 600 H.O. SDI2006-2006 SKI DOO BRP MX Z ADRENALINE 2-TEC 600 H.O. SDI2007-2008 SKI DOO BRP SUMMIT ADRENALINE 600 H.O. SDI2005-2005 SKI DOO BRP MXZ ADRENALINE 600 HO SDI2004-2004 SKI DOO BRP LEGEND SPORT GT V-1000 (4 STROKE)2005-2005 SKI DOO BRP GSX LIMITED 600 HO SDI2011-2011 SKI DOO BRP MX Z TNT (XP) 6002005-2005 SKI DOO BRP MXZ X 800 HO DPM2003-2003 SKI DOO BRP MX-Z REV SPORT2003-2003 SKI DOO BRP SUMMIT HIGHMARK 1512009-2009 SKI DOO BRP MX Z TNT 500SS (2)2005-2005 SKI DOO BRP GTX SPORT 600 HO SDI2004-2004 SKI DOO BRP LEGEND GT SE 800 SDI2004-2004 SKI DOO BRP GSX SPORT 1-UP 500 SS2004-2004 SKI DOO BRP GSX SPORT 2-UP 600 H.O.2010-2010 SKI DOO BRP GSX SPORT 6002004-2004 SKI DOO BRP GSX SPORT 2-UP 600 H.O. SDI2004-2004 SKI DOO BRP SUMMIT HM XTREME 800 H.O.2007-2007 SKI DOO BRP MXZ RENEG. X 800 H.O. POWER T.E.K.2008-2008 SKI DOO BRP GTX 600 H.O. SDI2004-2004 SKI DOO BRP LEGEND SPORT V-1000 (4 STROKE)2004-2004 SKI DOO BRP LEGEND GT SE V-1000 (4 STROKE)2008-2008 SKI DOO BRP MX ZX 800R2008-2008 SKI DOO BRP SUMMIT EVEREST 800R2005-2005 SKI DOO BRP MXZ RENEGADE 800 HO DPM2007-2007 SKI DOO BRP ADVENTURE V-8002005-2005 SKI DOO BRP GSX SPORT 600 HO SDI2006-2006 SKI DOO BRP MX Z RENEGADE 800 H.O. POWERTEK2008-2008 SKI DOO BRP MX Z TNT 500SS2007-2007 SKI DOO BRP GTX LIMITED 800 H.O.PWER T.E.K2005-2005 SKI DOO BRP MXZ ADRENALINE 800 HO2003-2003 SKI DOO BRP LEGEND SE2005-2005 SKI DOO BRP GSX SPORT 500 SS2006-2006 SKI