Brother S1000rr Main Generation 4k thiyanwa. 2009-2011 1st Gen 2012-2014 (HP4) 2nd Gen 2015-2019 3rd Gen 2019- Present 4th Gen Mainly Cooling System Liquid Cooling thamai. Extra Direct Air Intake(air cooling) wagema Oil Cool wenawa. Totally Review eka maru brother.Keep it up ✌