VTT S55 Spline Lock Crank Hub with complete package with crank bolt capture Upgrade BMW M2/M3/M4

Under certain conditions, the S55 crank hub likes to spin, without warning and even when the engine is in perfect health. The engineers at Vargas saw and dealt with this problem time and again, and they saw fit to do something about it.

This hub uses a proprietary "Spline Lock" technology that uses high tolerance machined splines which press into the crank, and positively lock the hub to the crank. The splines are machined in such a way that rotational forces drive the hub, and splines deeper into the crank meaning when the hub encounters a situation that would normally slip a stock hub the splined hub is driven into the crank to keep it in place (much like a splined extractor).

Features:

• Installs the same as a stock hub
• Does NOT require the crank to be drilled for pins
• Manufactured from Hardened 17-4SS

Includes:

• Crank Hub
• Crank Bolt Capture

We suggest the Crank Hub System ONLY be installed by a qualified shop or technician. Timing tools are 100% REQUIRED if installed improperly engine damage may occur.

DISCLAIMER: VTT and ECS are not responsible for any engine damage caused by improper installation, or misuse of the crank hub solution.  The product comes with no warranty as it is intended as a race part only. Vargas' install guide is meant to assist a skilled technician when installing this part. Procedures differ from the factory and should be followed according to the guide. We cannot warranty the OEM parts sold with these kits, if an issue is found we can speak with BMW about a replacement.