| |  | | VW VR6 Parts |  | MK4 Crank Underdrive Pully Kits: Tap into hidden horsepower with a new Euro Sport crank underdrive pulley! CNC machined from 6061 aluminum , se crank pulley kits underdrive your accessories by 23% on 4 cylinder engines 13% on VR6 engines. Th , in turn , decreases engine drag , unleashing power that you never knew you had. And since Euro Sport crank underdrive pulleys are lighter than OEM crank pulleys , you'll benefit from weight reduction of rotating mass; resulting in a more responsive engine.As an example , compare Euro Sport Mk3 8v pulley at 7.6 ounces to OEM Mk3 8v pulley at 3 lbs. 4 ounces. Euro Sport crank underdrive pulleys come in a blue anodized fin h. Each kit comes with installation instructions a new serpentine belt or bracket , depending on application. Part # 19014 applies to all New Beetle Applications Application Part # MK4 2.0L - 8v 19014 MK4 1.8T - 20v 19014 MK4 VR6 - 12v 19016 MK4 VR6 - 24v 19018 Pictured Below on Left: MK4 2.0L/1.8T Underdrive Pully Pictured Below on Right: MK4 VR6 Underdrive Pully Photography by: hzimara |  | Ultra SS Lightened Aluminum Underdrive 3-Piece Pulley Set (Crank , Alt. , & P/S): Unorthodox Racing Ultra Street lightened underdrive pulleys are CNC-machined from lightweight 6061-T6 aluminum billet. Premium 6061-T6 aluminum billet ensures cons tency of material's strength balance. Tolerances are held to within .001" , numerous machining steps are used to ensure lightest possible design. In addition to fit , fin h just as important each piece representative of th . Power Gains Unorthodox Racing pulleys can provide gains of 5 to 12 HP 4 to 8 ft.-lbs. on normally aspirated engines 8 to 16 HP 8 to 18 ft.-lbs. on forced induction engines. These are average gains. Gains as high as 37 HP 45 ft.-lbs. have been realized on modified forced induction engines. These gains are obtained in two ways. First , most important , weight loss. An average of 2.7 HP gained from every pound lost off crank shaft. 85% of our gains are from weight loss. The rest of gains are from underdriving , which accounts for about 15% of total gains. Unorthodox Racing does not push underdriving for two main reasons. Our main reason to keep charging systems , air conditioning , power steering , water pumps moving fast enough for every day driving. Second , not much horsepower gained from extreme underdriving. All of our underdriving done with crank pulley , not accessory pulleys. Th done so maximum weight loss can be achieved at crank where most of horsepower gains are found. Please note: Belt(s) not included. Instructions provided with underdrive pulley will give recommended belt sizes. Belt(s) can be purchased at your local auto parts store. | |