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CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (100.5mm) - Size (+1.0mm) - CR (8.2) Set of 4


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100.50mm Bore Size (+1.0mm over stock size)

8.2:1 Compression Ratio

Deep valve relief depth accommodates high lift camshaft

Can be used with +1mm valve sizes

Custom skirt cam and barrel design

Accumulator grooves

High strength aluminum forgings

High performance rings

Fully CNC machined and balanced to +/- 1 gram

Wrist pins included at no additional cost

Double pin oilers, force fed oil ring


2004-2012 Subaru STI

Actual Product May Vary from Image.


This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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