Fits all RZR Turbo models including Turbo S & Pro XP/Turbo R Sold as a pair For 2016 models we step down 1 heat range in the spark plug which helps prevent unwanted detonation under higher boost pressures. 2017 and newer models come with lower heat plugs from the factory, but these are a superior replacement plug. They are not lower heat, but are a more robust spark plug meant to take the abuse. Spark plugs gap set to .020" Part number: 112-1004-A - RZR XP Turbo Lower Heat Spark Plugs with (Iridium IX Fine Tip)