Supertech piston set for Subaru STi with a 100mm bore and -20.5cc dish producing an 8.3:1 compression ratio. These pistons are coated and sold as a set of four; piston rings are not included. They are intended for STi rebuilds where the coated surface treatment and dish volume are required to achieve the listed compression and durability characteristics.
Supertech Subaru STi 100mm Bore -20.5cc 8.3:1 CR Coated Pistons- Set of 4 (Excl Rings)