Free up HP with no downsides...
Direct fit for E90, E92, E93 M3- The VAC S65 Underdrive Power Crank Pulley is the simplest way to start improving the already spectacular performance of your V8 M3.
Always made using only virgin billet aluminum, a hard anodized finish, precision balance, and the tightest tolerances; our pulleys are used on the fastest BMWs on the planet.
Trust the company that supplies winning teams and hobbyists around the world, VAC Motorsports.