GFB 06-08 Volkswage/Audi 2.0T Super Lightweight Non-Underdrive Crank Pulley SuitsIt might be hard to imagine how reducing the mass of a pulley makes a car go faster, but accelerating a heavy factory pulley from say 3000 7000 RPM in a second or two saps a measurable amount of torque. GFB Lightweight Pulleys reduce inertia by up to 85 percent, so most of the torque that used to accelerate the pulley can now be applied to the wheels. This Part Fits: Year Make Model Submodel 2006 2012 Audi A3 Base 2010 2013 Audi A3 TDI 2015 2016 Audi