Unorthodox Racing's Tuner S Underdrive Crank Pulleys set a new standard for accuracy and finish at a price conscious level while retaining the use of the factory accessories. Power gains across the entire RPM range are realized from both the lightweight billet construction, and precise underdriving of the accessories An average of 2.7 HP is gained from every pound lost off the crank shaft, and 85% of the total power gained is from weight loss. The amount of underdrive is precision tuned for two main reasons. First, it is important to keep charging systems, air conditioning, power steering, and water pumps moving fast enough for every day driving. Secondly, horsepower gains from extreme underdriving are minimal.

**An important point: At this price conscious level, critical tolerances are still held to .001"! This is something never before seen in this price range.

Tuner S crank pulleys are CNC-machined from lightweight 6061-T6 billet aluminum. Premium U.S. made 6061-T6 aluminum billet ensures the consistency of the material's strength and balance. Tolerances are held to within .001", and numerous machining steps are used to ensure the lightest possible design. In addition to fit, finish is just as important and each piece is representative of this. Every pulley is inspected multiple times from machining to anodizing to stocking and finally at shipping time. If at any point a pulley does not pass inspection it is pulled from production. Tuner