COSMO RACING PERFORMANCE Lightweight Underdrive Pulley for BMW
T-6061 Aircraft Lightweight Billet Aluminum constructed & harden anodized
Direct bolt on part in replacing with stock pulley; different size belt(s) will be needed in order to complete the installation . You will be supplied with all necessary belt size(s) info in instruction sheet*, and personal assistance from our tech support to guide you through any problems!
Note: Installation for the underdrive crank pulley is not as plug and play part and it requires DIY, special wrench tools, and mechanism level knowledge. However, professional installation is recommended for those with no mechanical knowledge. *Instruction sheet might not be available for some models, please check and inquire the instruction availability on each product info.