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      06-24-2014, 01:24 AM   #1
isherdholi's Avatar
Drives: M3
Join Date: Oct 2012
Location: London, UK

Posts: 60
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For Sale: E9x M3 Active Autowerke Underdrive Pulley (+12bhp)

For sale is an Active Autowerke Underdrive Pulley, complete with a set of slightly used (but mint condition) belts and also an additional set of brand new belts which I bought as spare just to keep in an emergency (probably overkill, I know)

Both sets of belts are of the correct size for single sided A/C belt cars (build date up to May 2008 I think) and a set of bolts. The double sided belt can be purchased from Active Autowerke.

Fitment is straightforward. Fan out, slacken the tension on the belts, remove an idler, swap the pulley and reverse.

Quoted from Active Autowerke's site: -

This is a complete bolt on kit engineered using Aircraft Grade Billet 6061 Hard Coat Anodized Aluminum. After months of R&D in house and overseas (various climates & conditions) we concluded that there may be a slight power increase by going smaller than our pulley but the trade off is a chance of making the engine run hotter or possibly overheat (we noticed this in both DCT cars and Manual cars on and off the track), we choose reliability over that extra 1-2 rwhp that we may get from a smaller pulley. Testing in Miami, FL and in other hot climates was a must in our R&D process to take things to the “extreme limits”.

Another key element in the development of the Signature Pulley Kit was to retain the “Factory Crank hex Drive Adapter”, this was important to keep this factory feature for its inherent purpose. The pulley kit does not modify factory harmonics or dampening. Stronger side walls were the last key element in choosing our size over a smaller design.

The Active Autowerke E9X Signature Pulley Kit yields gains of 12+HP on a completely stock car This is a complete bolt on system that is easily reversible. A must for the true enthusiast.

Key Features:

* HP gains: 10 RWHP ~ 12+ HP
* Complete Bolt on System and is easily reversible
* Aircraft Grade Billet 6061 Hard Coat Anodized Aluminum
* Retains Factory Crank Hex Drive Adapter
* Includes Replacement DRIVE and A/C Belts
* Does Not Modify Factory Harmonics or Dampening
* Compatiable for DCT and Manual models
* Reduces Rotational Mass
* Does not cause overheating found in smaller pulley designs

These are $540 delivered which is around 325 at current exchange rates. I looking for 210 delivered (that's a bargain with the additional belts )

Here are some pics from the original for sale thread from when I bought it: -

Stock pulley on the left, Active Autowerke Pulley on the right: -


Last edited by isherdholi; 06-24-2014 at 01:34 AM.
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