aFe Power 79-10002 Crankshaft Underdrive Pulley Kit for BMW M3 E90 E92 E93 (E9X) S65 4.0L

aFe 79-10002 Crank Underdrive Kit for BMW M3 S65 4.0 litre V8

Unlock effortless performance on the E9X M3 platform with the aFe 79-10002 underdrive crank pulley kit. Precision CNC machined from billet aluminium and finished in durable black anodising, this direct fit accessory drive upgrade reduces parasitic drag on the S65 engine for sharper response and proven gains. Independent dyno testing has shown increases of up to 10 bhp and 7 lb ft while maintaining OE harmonics and damping characteristics for complete peace of mind.

Ideal for owners searching for BMW M3 crank pulley kit, S65 underdrive upgrade, E9X lightweight crankshaft pulley, serpentine belt pulley set, drive belt reduction kit, M3 4.0 V8 engine pulley kit or aFe 79-10002.

Why this upgrade

• Real-world performance uplift on the S65 4.0 litre V8 with dyno-verified increases up to 10 bhp and 7 lb ft
• Lightweight CNC billet aluminium construction with black hard anodised finish
• Direct replacement, bolt-on installation with no permanent modifications
• OE-style harmonics and damping retained for reliability
• Complete kit with matched belts and new hardware
• Perfect for fast-road and track-day E9X M3 builds seeking reduced accessory drag and crisper throttle response

Vehicle fitment

BMW M3 with the S65 4.0 litre V8:

• E90 Saloon
• E92 Coupé
• E93 Convertible

Model years 2009 to 2013. Fits vehicles built from June 2008 onward.

What you receive

• aFe crank underdrive pulley
• Correct length belts for this application
• Mounting bolts

Installation and fitting

Straightforward bolt-on job for a competent DIYer. For professional installation in the UK, book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Prefer to install yourself You can download the official aFe fitting guide here: aFe 79-10002 Installation Instructions.

Part number

79-10002

Why buy from MJ Modifications

We have installed this aFe crank pulley kit on customer cars and our own S65 builds. Owners consistently praise the fit and finish, the noticeable performance improvement and the reliability of this upgrade. It is a proven E9X M3 engine drive solution that enhances the driving experience without compromising refinement.

Compatibility check before dispatch

We verify fitment before shipping. Please supply your UK registration number or the last 7 digits of your VIN at checkout.

Warranty

Supplied with a 1 year manufacturer warranty.

Search terms people use for this item include BMW M3 S65 crank pulley kit, E9X M3 lightweight crank pulley, accessory drive underdrive kit, serpentine belt pulley set, engine pulley upgrade, E90 E92 E93 4.0 V8 pulley, billet alloy crank pulley, black anodised pulley, dyno tested M3 pulley kit, aFe 79-10002.