E46 Underdrive Pulley Kit

For the construction of the Ultimate Underdrive Pulleys, 6061-T6 heat-treated aluminum was the best choice for several reasons. Due to its density and strength characteristics, mass differences between the OE accessory pulleys and the UDP are optimized while retaining factory-like longevity. The precision fit of the Ultimate Underdrive Pulleys begins on a CNC lathe, and continues in a multi-axis mill where the cosmetic " power swirls" are added.

One of the other reasons for choosing 6061-T6 aluminum for the construction of the Ultimate Underdrive Pulleys is the ease with which this material can be anodized. UUC's hard anodized finish is not only cool to look at, it helps eliminate belt slippage and boasts improved wear characteristics over the life of the pulleys.

For the smoothest installation possible the kit includes a new, high quality, correct-length accessory belt.

The Finished Product is a set of pulleys that fits like factory, accepts a commonly available belt for easy long-term ownership, and boasts impressive gains for not a lot of money.

Underdrive Pulley Kit includes: water pump, power steering pump pulleys and new correct length accessory belt.