Arias Forged Pistons Subaru WRX EJ255 99.75mm +0.25mm -8.4 cc 10.1:1 3620330


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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.


More Information
Shipping Weight (Dimensional) 5.000000
Clearance Sale No
Availability Discontinued
Part Type Pistons
Make Subaru
Vehicle Model Impreza WRX
Model WRX 06-07 GD, WRX 06-07 GG, WRX 08-14 GR
Engine EJ255
Rod Length 5.137" / 130.5mm
Rod Length Oversize Standard Length
Bore Diameter 99.75mm
Bore Oversize 0.010" / 0.25mm
Stroke 79mm (Standard Stroke)
Compression Ratio 10.1:1
Compression Ratio Range 10.0:1 - 11.0:1
Included Ring Set 1212203927
Head cc 51 cc
Face Type Dish
Dome cc -8.4 cc
Compression Height 1.208" / 30.7mm
Brand Arias Pistons
Skirt Type Full Round
Piston Material 2618
Engine Head EJ255
Carb Legal Unspecified


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