Turner Motorsport Power Pulley Kit - E46 with Bosch Alternator

Unlock hidden bhp on your BMW E46 with this Turner accessory drive pulley set designed for cars running the Bosch charging system. By reducing parasitic drag from belt-driven ancillaries, this upgrade releases power that would otherwise be consumed by the water pump, steering pump and alternator. Expect sharper throttle response and a livelier rev-happy feel on straight-six engines, all while keeping everyday reliability in check.

Why enthusiasts choose this pulley upgrade

• Proven performance: accessory speed reduced by approximately 10–20 percent, helping release up to 11 hp on most BMW six-cylinder engines.
• Noticeable drivability gains: crisper response off the line and through the rev range.
• Street-focused ratios: optimised for fast-road and track-day use without compromising system function.
• Decade-plus track record: extensive development and testing on and off circuit, with zero pulley-related component failures reported.

Premium construction

• T-6061 aluminium pulleys with a durable black hard-anodised finish for superb resistance to wear, heat and chemicals.
• OE-style appearance with improved strength and weight savings compared to many factory items.
• Engine accessory set targets the water pump, power steering pump and alternator for balanced reduction across the serpentine belt drive.

Real-world results from MJ Modifications
We have installed this upgrade for customers looking for a simple, bolt-on performance mod for their E46 inline-six. Feedback has been consistently positive, praising the extra urgency and responsiveness without fuss or drama. It is a brilliant value performance enhancement for those chasing usable gains.

Compatibility note
For E46 models equipped with a Bosch alternator/charging system. If you are unsure which alternator your car has, contact us and we will be happy to help confirm before purchase.

Professional fitting available
Want it installed perfectly first time? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quotation.

Common search terms
BMW E46 pulley upgrade, under-drive pulley set, lightweight accessory pulleys, serpentine belt pulley kit, alternator pulley upgrade, water pump pulley E46, power steering pulley E46, drive belt reduction kit, performance pulleys for BMW 3 Series, inline 6 pulley kit, parasitic loss reduction, fast road pulley upgrade, track day pulley kit, hard-anodised aluminium pulleys.