ItalianRP Silver line piston set for the BMW S55B30 3.0 twin-turbo (6 cylinders), 84.00mm standard bore, 10.20:1 compression, OEM stroke and compression height. Silver line: 4032 aluminium, double-bridge design, without galvanic coating (ItalianRP machines its Gold line from 2618 aluminium and its Platinum line is billet forged 2618). Made in Italy. Piston clips CIRP22; matching ItalianRP rod IRPR504. For the S55 in the M2 Competition / CS, M3 (F80) and M4 (F82 / F83).