If you've got a built motor or a highly modified 1.8T then you can benefit from the increased reliability, power, and driveability from a Fluidampr crank pulley. Fluidampr uses a viscous fluid to dampen vibrations, unlike others that use an elastic material that wears over time. Some Fluidampr Benefits: Increased reliability and efficiency due to lower destructive engine vibrations, especially needed if you are using a lightweight flywheel Real Horsepower and Torque increase Better driveability and comfort especially when used with a lightened flywheel or stiff motor mounts. Will fit all 06A 1.8T engines only! Will not fit early 058 block engines!