Mahle PowerPak 2.1 Stroker Pistons - 92.5mm (EJ20)


  • Forged piston for performance applications
  • Fully-machined crown
  • Grafal anti-Friction coating on skirts*
  • Phosphate-coated to reduce micro-welding and pin galling**
  • Pin bores binished on CNC boring equipment
  • Deburred
  • High strength, light weight steel pins
  • Race proven round wire locks
  • Low drag ring pak
  • Light weight slipper skirt forgings

The MAHLE Motorsports Power Pak kit is Mahle's high volume shelf stock program developed for high performance enthusiasts and sportsman class racers. The Power Pak pistons are predominately made from 4032 aluminum alloy to allow for tighter cylinder to wall clearances, and improved temperature stability. Some applications require 2618 alloy including the Power Pak Plus category. Each kit is complete with a set of high performance rings, containing a low drag 1.5mm, 1.5mm, 3.0mm set or 1/16, 1/16, 3/16 high performance Ring Pak standard with big block kits.

EJ205 Stroker Piston Specifics (2.1 Liter Stroker):

  • 92.5mm bore (.5mm over stock)
  • For 79mm stroke Crank (OEM STI) with 130.4mm rod (OEM STI)
  • 16cc Dome Volume
  • Weight - 333 grams
  • 8.0:1 Compression Ratio

MAHLEs GRAFAL skirt coating reduces drag, scuffing, friction and cylinder bore wear; reduces piston noise.

Phosphate coating provides the grey appearance to the MAHLE piston. This dry lubricant coating (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure; particularly useful during the initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machineable.

warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to

More Information
SKU MHL929847842
Product Type Engine
Engine Engine Internals
Brand Mahle Pistons
Need Help with this product?

Chat with our staff using our Live Chat, Call us at 303.402.5142 or Email us at
Fast Shipping

Products ship within 2 days.

Easy Returns

Friendly return policy because our priority is making sure you have the right product.

Safe and Secure Shopping
click here