Part number 337966.

JE Pistons forged piston kit (5 pcs.) CR 9.5:1 82.50mm (STD) with Perfect Skirt coating.

For Audi TT RS, RS3 - 2.5 20V TFSI (CEPA, CEPB).

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!