These pistons feature skirt diameters that correspond to the OEM Grade A or B bores resulting in a piston to wall clearance range of .0023" - .0031".
Please check the bore grades on the top of your block and order the appropriate quantities of Grade A or B pistons.
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.
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
For 75mm De-Stroke and 132.5mm Long Rod
Shipping Weight (Dimensional)
WRX 06-07 GD, WRX 06-07 GG, WRX 08-14 GR
5.216" / 132.5mm
Rod Length Oversize
0.079" / 2.0mm
75mm (2.3L De-Stroker)
Compatible with Stock Sleeves
Requires Aftermarket Sleeves
Compression Ratio Range
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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