Kies Motorsports Crank Bolt Lock, BMW N54/N55/S55 M40iX 85 mm bore size results

85 mm bore size results in a displacement of 3303 cc

5 mm bore size yields a displacement of 3342 cc

Whether you're seeking a mild upgrade for enhanced daily driving or a more aggressive profile for competitive racing

They also offer crucial protection against sudden engine failure

Kies Motorsports Crank Bolt Lock, BMW N54/N55/S55 M40iX 85 mm bore size resultsThe 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