Arias Forged Pistons w/ Rings | 2004-2021 Subaru STI EJ25 (3620000)

ARIAS PISTONS has been the leader in compact piston technology since our beginnings. While piston suppliers at that time focused mostly on larger-bore domestic V-8's, ARIAS had the foresight to cater to the smaller-bore, higher-revving, hotter-running imports & domestic compacts.Today, ARIAS maintains an unmatched advantage in the import and domestic compact market. Over three decades of research and development have led to the ARIAS Sport Compact shelf line.- Hi-tensile forged, not cast, billet material (4032 or 2618).- CNC machined working surfaces.- Optimized crowns for efficient combustion.- Diamond-turned ellipsoidal skirt profile.- All motor/Nitrous pistons feature lightweight, high strength construction.- Turbo/Nitrous pistons feature durable, heavy-duty design.Sport Compact stocking kits include:- Forged pistons with pin fit.- Wrist pins: High carbon, case-hardened.- Ring set: chrome or moly faced top, cast 2nd, 3-piece oil.- Locks: carbon steel wire or spiral.Fits: Subaru Impreza STi EJ25Stroke: 3.110Compression Ratio: 8.3:1Gram Wight: 374Part number:3620000 - Std. Bore