Product detailed specification

Bore size

100mm

Stroke

79.00mm

Wiseco compression ratio (CR)

9.0:1

OEM compression ratio (CR)

8.0:1

Dome volume (CC)

-19cm3

Compression height (CH)

30.70mm

Pin diameter

23mm

Fits for

Subaru WRX STI 2.5 (EJ257)

Armor Plated wiseco pistons have almost a bronze colored tint to the top of the piston and the wrist pin bore. Wiseco's Armor Plating is an abrasion resistant plating that raises the hardness of the aluminum, increases the durability of the ring grooves, prevents micro-welding of the piston rings, reduces carbon buildup and combats corrosion caused by detonation. Wiseco's most popular pistons now include Armor Plating.