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Product detailed specification Bore size 82.50mm Stroke 86.40mm JE Pistons compression ratio (CR) 9.0:1 OEM compression ratio (CR) 9.3:1 Dome volume (CC) -5.70cm3 Compression height (CH) 30.70mm Pin diameter 21mm Features Accepts Turbo and Nitrous; Round skirt Fits for Audi S4, RS4, A6 - 2.7 30V  JE's patented Perfect Skirt coating makes piston slap, false knock, and cold-start wear a thing of the past. For the first time ever, 2618-alloy pistons can be installed with piston-to-wall clearances near that of an OEM piston!