Kies Motorsports Crank Bolt Lock, BMW N54/N55/S55 M40iX The Pro-Xtreme design from CP-Carrillo

The Pro-Xtreme design from CP-Carrillo ensures that these connecting rods can handle the intense stress produced by high-boost turbo applications and racing conditions

Unmatched Performance for BMW S52 Builds

85 mm bore size results in a displacement of 3303 cc

C | BMW B58 Gen1

race-proven durability

Kies Motorsports Crank Bolt Lock, BMW N54/N55/S55 M40iX The Pro-Xtreme design from CP-CarrilloThe Kies Motorsports Crank Bolt Lock acts to "lock" the crank bolt on the S55, N55, and N54 in an effort to prevent the crank bolt from backing out, which can lead to catastrophic engine failure. By locking the bolt into place, you virtually eliminate the possibility of the crank bolt working its way loose. Please note, by adding the Kies Crank Bolt Lock, it is still possible to spin a crank hub, however, it lessens the risk of the hub spinning