EJ257 Platinum Series 8.5:1 Dish Pistons with Rings - 99.75mm +.25mm Bore

• 2004-2007 Subaru | WRX STI
• 2006-2007 Subaru | WRX

Manley's Platinum Series pistons deliver forged strength for Subaru EJ257-based 2.35L de-stroked builds — 2004-2007 WRX STI and 2006-2007 WRX. Machined from high-strength 2618 alloy forgings with an offset wrist-pin design for quiet start-ups, these 99.75mm (+0.25mm overbore) dished pistons are designed for a 75mm de-stroked crank and yield 8.5:1 compression for big-boost applications. Every kit includes moly-coated skirts, premium chrome moly wrist pins, round wire locks, and premium steel top rings with Napier second rings and higher-tension oil rings from Total Seal.

• Part number: 621002C-4 — set of 4 pistons, wrist pins, ring sets, and round wire locks
• 75mm de-stroked build (2.35L); bore 99.75mm (+0.25mm overbore); -18cc dish; 51cc head; 8.5:1 compression
• 5.137" rod length, 1.285" compression distance; 434 grams each
• Machined from high-strength 2618 alloy forgings with cam and barrel skirt profiles
• Moly-coated skirts and pressure balance groove reduce friction and improve ring seal
• Includes Total Seal ring set 46997DT-4, premium chrome moly wrist pins, and round wire locks
• Accommodates +1mm valve sizes; recommended piston-to-wall clearance .003" (mild boost) / .0035" (high boost)
• Requires a 75mm-stroke de-stroked crank; professional installation required — cylinders must be bored and honed to 99.75mm

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