Kies Motorsports Crank Bolt Lock, BMW N54/N55/S55 M40iX 5 mm bore size yields

5 mm bore size yields a displacement of 3342 cc

C | BMW B58 Gen1

Supports distributor

(2) Heat Shields with M8 x 16mm

black anodized 35mm certal-aluminum main bracket for extreme rigidityESS custom casted

Kies Motorsports Crank Bolt Lock, BMW N54/N55/S55 M40iX 5 mm bore size yieldsThe 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