CP Pistons Ring Set – EJ255 / EJ257 Engine – 100mm Bore (Single Piston)

Precision-Engineered Piston Rings

CP 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 Pistons

This 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

Fitment

Subaru 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.