Forged pistons kit Wiseco K598M100AP 4 cyl, Subaru Impreza WRX STI EJ257 2.5l 16V 04+ Bore 3.937 (100.0mm) Size +0.5mm CR 9.1
Forged pistons kit Wiseco 4 cyl, Subaru Impreza WRX STI EJ257 2.5l 16V 04+ Bore 3.937 (100.0mm) Size +0.5mm Compression Ratio 9.1
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