Manley Turbo Tuff Forged Piston Subaru WRX EJ255 De-Stroke Long Rod Grade B 99.50mm -17cc 8.6:1


Not in stock at our Sanford, FL location but electronically verified in stock at the Manufacturer/Distributor within the last 12 hours. (aka: not experiencing a supply delay)



(Sold as -1 individual piston, not sets.)

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


More Information
Availability New In Stock / Available
Note For 75mm De-Stroke and 132.5mm Long Rod
Item Weight 417 g
Shipping Weight (Dimensional) 1.300000
Clearance Sale No
Availability Available
Part Type Pistons
Make Subaru
Vehicle Model Impreza WRX
Model WRX 06-07 GD, WRX 06-07 GG, WRX 08-14 GR
Engine EJ255
Rod Length 5.216" / 132.5mm
Rod Length Oversize 0.079" / 2.0mm
Bore Diameter 99.5mm
Bore Oversize Grade B
Stroke 75mm (2.3L De-Stroker)
Compatible with Stock Sleeves Yes
Requires Aftermarket Sleeves No
Compression Ratio 8.6:1
Compression Ratio Range 8.0:1 - 9.0:1
Pin Size 0.905" / 23mm
Upgraded Pin (not included) 42547
Included Ring Set 46995DT-1
Included Pin 42346
Head cc 51 cc
Dome cc -17 cc
Compression Height 1.209" / 30.7mm
Piston Coating Skirt Coating
Brand Manley Performance
Skirt Type Full Round
Piston Material 2618
Carb Legal Unspecified
Wrist Pin Wall Thickness 0.180"
Wrist Pin Dimensions .905" x 2.500" x .180"
Pin Material 5115 Steel
Shipping Label Free Shipping


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