Precision-Engineered Piston RingsCP Pistons ring set designed for EJ255 and EJ257 engines with 100mm bore. Built for high-performance and forced induction applications where reliability and ring seal are critical.Specifications Bore size: 100mm Engine compatibility: EJ255 / EJ257 Quantity: Single piston ring set Part number: RS1658-3937-0 Material: Premium steel construction Design: Low-tension for reduced friction and improved sealing Compatible CP PistonsThis ring set fits the following CP Pistons part numbers: SC7431 SC7421 SC7427 SC7417 SC7435 SC7439 Key Features CP Pistons quality – proven in motorsport and high-performance builds 100mm bore fitment – compatible with oversized piston applications Low-tension design – reduces friction while maintaining excellent ring seal Heat-treated steel – withstands high cylinder pressures and temperatures Direct replacement – works with CP Pistons and compatible aftermarket pistons FitmentSubaru EJ255 / EJ257 engines (100mm bore): WRX STI VA (2015-2021) WRX STI GV / GR (2008-2014) WRX STI GDB / GC (1994-2007) WRX GH / GE / GDB / GDA / GC (1992-2014) Note: Sold as a single piston ring set. Order quantity required for your build (typically 4 sets for a complete engine rebuild).Australian stock with local warranty support through Chicane Australia.
