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Active Autowerkes

Active Autowerke Underdrive Pulley Kit BMW M3 E90/E92/E93 S65

Active Autowerke Underdrive Pulley Kit BMW M3 E90/E92/E93 S65

Regular price $439.00 CAD
Regular price $461.00 CAD Sale price $439.00 CAD
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Belt Style

This is a complete bolt on kit engineered for BMW Performance tuning. Uses aircraft grade billet 6061 Hard Coat Anodized Aluminum for the strength and durability.

The BMW S65 V8 engine as used in the BMW E9X M3 does not make available all of the horsepower that the engine actually produces. This Power Pulley KIT through a redesign of the crankshaft outer pulley, actually releases this developed and available horsepower.

This performance product is designed to not only to make available horsepower but to still retain all the inherent qualities of your BMW E9X M3 without sacrificing reliability.

Another key element in the launching of this under-drive pulley system was the task of manufacturing a DPK, a double side belt for the air conditioner. Whenever you alter the crankshaft main pulley size, it will also influence the size of the A/C belt. As of late production 2007, BMW change over the belt configuration to a double sided groove belt on the E9X M3. Active Autowerke philosophy is always to try and maintain components like a BMW fashion, as if BMW would have done. This would be a first in the BMW performance industry to have an aftermarket DPK belt produced.

To further enhance the system, Active Autowerke will provide an extra spare DPK belt with the kit. This would be for emergency circumstances if the need ever arises.

Tested and ran on the in-house Mustang dyno here at Active Autowerke quantifies a true measurable 12 + horsepower gain on a completely stock BMW M3.

Anodized in a hard finish as revealed by the almost jet black color also makes this BMW performance product seem obscure within the engine bay. This performance upgrade is easy to install and can be fully reversible if the need arises. It is packaged to be simple with a crank pulley and correct matching belts in a all inclusive KIT.
Please verify your E9X M3 on the A/C belt if single sided or double sided (DPK) when ordering.

A must for the true BMW M enthusiast that wants to "... COME PLAY WITH POWER..."u00a0

Key Features:

BMW HP gains: 10 RWHP ~ 12+ HP over stock
Complete Bolt on System and is easily reversible
Aircraft Grade Billet 6061 Hard Coat Anodized Aluminum
Simple and easy to install
Includes Replacement DRIVE and A/C Belts
EXTRA spare DPK belt provided where applicable
Designed for use on DCT and Manual models
Reduces Rotational Mass
Does not cause overheating found in smaller pulley designs
Pair with AA Software for Additional Gains
Available for all production dates ( Single sided & DPK belts )


How to tell if you have a DPK or SINGLE sided belt on your V8 powered M3:

  • Take a look at the water pump belt, you will see that the belt is smooth on one side and has multiple grooves on the flip side. This is referred to as a SINGLE side belt.
  • Take a look at the A/C belt, if the belt looks, feels similar to that of the SINGLE sided belt that drives the water pump. We designate this as a 2007 ONLY model or models produced up 05/2008 which carries a single sided PK belt.
  • Take a look at the A/C belt, if the belt hasu00a0multiple grooves on either side, then you have a DPK belt. Which is a belt with double PK grooves on both sides. Production model should fall from 6/2008 and up.u00a0
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        BM3 Vehicle Compatibility and Unlock Status Check Procedure

        Connect to your vehicle, (you need to get an OBD2 Ethernet cable and an MFI certified adapter cable if applicable or a WiFi adapter) start the OBD agent (you can get it here: or our APP) and before you’re about to log in on , click on the ‘check support' button on the right-hand side. If using our app, login, click on vehicle and you should have this information (if locked or unlocked) already displayed on that page.

        Message written in bold letters under your software ID's will let you know if we have support for your engine type. It will also tell you if you need a bench unlock or not, and what type of an unlock is needed if you do need one.

        If the message states that your DME requires a bench unlock before flash-tuning your vehicle, you will need to reach out to one of our authorized dealers and inquire about a bench unlock. The listing for all of our authorized dealers can be found in the link attached below.