Subaru WRX / STI MAHLE Motorsports Forged Piston Kit - Modern Automotive Performance

Subaru WRX / STI MAHLE Motorsports Forged Piston Kit

Mahle
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The MAHLE Subaru STI PowerPak is a complete, race proven piston kit composed of hand de-burred, all forged, performance coated pistons, high quality steel wrist pins, round wire locks and low drag performance piston rings.
Performance coatings include a phosphate dry lubricant that is used to protect against ring micro welding and pin galling during initial start-up and engine break-in. For added performance, MAHLE applies it's proprietary "Grafal" anti-friction coating to each piston skirt.

The MAHLE WRX PowerPak was designed as a completely finished drop-in piston assembly for your Subaru WRX or STI. Other than filing the included performance ring set, everything else is done for you.

* Forged from 4032 low expansion aluminum alloy for high strength and reduced piston to wall clearance
* Radiused valve pockets
* Forced Pin Oiling
* Precision Pin Fitting and Race Proven Round Wire Locks included
* 23mm high quality steel wrist pin (123 grams) included
* Precision Ring Grooves for 1.2, 1.2, 2.8mm rings included

WRX EJ20 Mahle Piston Specifications:
- Stroke: 75mm
- Rod Length: 130mm
- Pin Diameter: 23mm
- Compression Height: 32.7mm
- Dome Volume: -12
- Weight in Grams: 92.5mm = 348, 93mm = 353
- Compression Ratio: 8.0:1

STI EJ25 Mahle Piston Specifications:
- Stroke: 79mm
- Rod Length: Stock
- Pin Diameter: 23mm
- Compression Height: 30.7mm
- Dome Volume: -22
- Weight in Grams: 99.5mm = 399, 100mm = 401
- Compression Ratio: 8.5:1

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Customer Reviews

Based on 3 reviews
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E
Evan Stout
Perfect

My build is a ej25 350hp subaru wrx. Engine has 68k miles and is still strong. No piston slap using 4032 alloy.

User picture
K
Kyle
Mahle 4043 pistons

Very happy with this product

O
Outon Bountham
Mahle pistons are awesome!!

Great bang for your buck!