The best aftermarket Subaru piston company just got even better with our new Turbo Tuff lineup targeted specifically for EJ25 engines. By incorporating proven design enhancements from our "Formula-Won" piston forging, we've created the ultimate Subi piston to withstand the rigors of the highest boosted and stressed applications yet still run "quietly" and trouble-free for the daily driver.
Like all Manley Subaru pistons, these are made from 2618 alloy, utilize an offset wrist pin design, are skirt coated and include our standard 2.500" x .180" wall premium chrome moly wrist pin (P/N 42346). 9310 alloy .250" wall pin upgrades are available. Premium steel top rings with Napier style second rings and higher tension oil rings for ultimate oil control are included with each set along with round wire locks.
Recommended clearance: .003" for mildly boosted and .0035" for highly boosted measured .850" (79/83mm Strokes) and 1.100" (75mm Stroke) from the bottom of the oil ring groove.
Manley Subaru EJ257 pistons now include Napier style second rings and higher tension oil rings (by Total Seal) for superior oil control.
2618 high strength material
Offset wrist pin for quiet start-ups
2.500” x .180” wall Premium Chrome Moly pin (Standard Series) included P/N 42346
Pressure balance groove
Will accommodate +1mm valve sizes
Premium Steel top rings with Napier seconds and round wire locks included
Recommended piston clearance: .003” for mildly boosted and .0035” for highly boosted measured .850” (79/83mm stroke) and 1.100” (75mm stroke) from the bottom of the oil ring.
In Stock / Available
Shipping Weight (Dimensional)
Impreza WRX STi
STi 04-07 GD, STi 08-14 GR, STi 15-21 VA
5.137" / 130.5mm
Rod Length Oversize
0.002" / 0.05mm
79mm (Standard Stroke)
Compatible with Stock Sleeves
Requires Aftermarket Sleeves
Compression Ratio Range
7.0:1 - 8.0:1, 8.0:1 - 9.0:1
0.905" / 23mm
Upgraded Pin (not included)
Included Ring Set
1.209" / 30.7mm
Wrist Pin Wall Thickness
Wrist Pin Dimensions
.905" x 2.500" x .180"
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