Introduced in 2018, the M2 Competition drops the N55 in favour of the S55B30 of the M3 F80 and M4 F82, rated at 411hp. Its stock is the same as that of the M2 CS: ZRP and MANLEY forged connecting…Introduced in 2018, the M2 Competition drops the N55 in favour of the S55B30 of the M3 F80 and M4 F82, rated at 411hp. Its stock is the same as that of the M2 CS: ZRP and MANLEY forged connecting rods, JE, MANLEY, WÖSSNER and DIAMOND forged pistons, ACL RACE and KING RACING tri-metal bearings for big ends and main journals, SUPERTECH and FERREA performance valves, springs, stem seals and collets. The uprated head gasket carried by this page is the COMETIC S55B30 reference, not to be confused with the ATHENA and COMETIC part used on the N55B30 pages.