Supertech Subaru/Toyota FA20/4U-GSE 86mm Bore 12.5:1 CR Pistons - Set of 4

Supertech pistons, made from extruded high silicone, enhanced 4032 alloy (with additional Cu, Ni & Mg), offer low thermal expansion, excellent wear resistance, and high thermal conductivity. They can withstand up to 42psi of boost with alcohol. The manufacturing process includes a two or three-step forging, CNC machining, and multiple heat treatments. Features include contact reduction grooves, honed and reamed pin bores, cold extruded chrome moly steel wrist pins with wire clip locks, and a 'phosphate dry lubricant' coating for ring protection and skirt/cylinder lubrication. Compatible with naturally aspirated and forced induction (turbo/supercharged) FA20/4U-GSE engines.