Reclaim horsepower; cut parasitic losses. ECS Tuning underdrive pulleys can help recover lost horsepower. This replacement for the weighted factory pulley is easy to install and comes in at a very light .52lbs - 84% lighter than the stock 3.25lbs. Providing a 20% underdrive takes power that would otherwise be used to spin accessories, and transmits that power safely and efficiently to the wheels. This reduction in rotational mass and underdrive affect help improve acceleration (especially in lower gears) while improving throttle response across the RPM band. Looking for hard numbers? We put our lightweight underdrive pulley to test on a 2012 MKVI Jetta 2.5L automatic and the results were impressive. We experienced a 0.7 improvement in 0-60 times and chipped 0.2 seconds off our quarter mile time. Great numbers out of a single bolt-on part! Featuring a black anodized finish, this pulley reuses the stock pulley bolts. No other modifications are required. Included in this ECS Lightweight Underdrive Pulley Kit is: ECS Black Lightweight Underdrive Pulley New shorter serpentine belt An excellent first modification or an equally good addition to an already modified Volkswagen.
