Supertech Forged Piston Kit - Subaru WRX STi 2.5L

Supertech Forged Piston Kit - Subaru WRX STi 2.5L

Supertech pistons are manufactured from extruded high silicon, enhanced 4032 alloy that low thermal expansion, excellent wear resistance and higher thermal conductivity. A phosphate dry lubricant coating is applied to pistons to protect against ring micro welding and enhance skirt lubrication.


  • Forged from enhanced 4032 alloy and CNC machined
  • Contact reduction grooves are standard
  • Honed & reamed pin bores and precise fit
  • High tensile strength and evenly distributed hardness
  • Withstands up to 42psi of turbo boost, w/alcohol, w/out any problems
  • A 2 or 3 forging steps process yeilds a fine structural grain oriented in fibers in the same direction of the stresses.
  • Wrist pins are constructed or cold extruded chrome molly steel for high strength to be used with the wire clip locks.
  • Quality Control is performed after every step of the manufacturing process in climate controlled environments to ensure reliability of dimensions
  • Wrist pins and wire locks are included.

Subaru WRX STi 2.5L Bore & Compression Ratio Options:

  • 99.50mm (std) / 10.5cr
    Must be used with rings: SWF20068-0
  • 99.50mm (std) / 8.2cr
    Must be used with rings: SWF20068-0
  • 100mm (std) / 8.3cr
    Use with rings: SWF20068-2
Images shown for illustration purposes. Piston kit contents can vary depending on application.

      Supertech Forged Piston Kit - Subaru WRX STi 2.5L

      Regular price Sale $692.29
      Free Shipping
      Free standard shipping applies to this item within the continental United States. Orders shipped to Alaska, Hawaii, Virgin Islands, Canada, Puerto Rico, Guam, and PO/APO/FPO boxes are subject to additional shipping charges.
      Ships: 1-5 business days
      This is an estimated ship date once your order is placed from JHPUSA. Ship dates do not include weekends and holidays.
      California Residents Warning:
      Cancer & Reproductive Harm
      Welcome Newcomer