Manley Turbo Tuff Extreme Duty Forged Piston Subaru WRX STi EJ257 Grade A 99.50mm -22cc 8.0:1

EJ25 - PLATINUM SERIES TURBO TUFF EXTREME DUTY GRADE A PISTON

(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.

These come equipped with the 9310 pins (P/N 42547) .250" wall pin upgrade. 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" (79mm Stroke) from the bottom of the oil ring.

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
• 9310 alloy .250” wall pin (Extreme Duty Series) included P/N 42547
• 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