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Supercharger Pulley 15% and 17% Reduction


3 Hours

Part Numbers
AMP-ENG-200V2: 15% Reduction
AMP-ENG-205V2: 17% Reduction

WARNING: Cancer and Reproductive Harm

Was: $139.00
Sale: $118.15
Save: 15%
Save: $20.85

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The quickest and easiest way to add 20+ Wheel HP to your MINI Cooper S!

Body Design

Constructed of lightweight 6061T6 aluminum, the ALTA supercharger pulley body decreases rotational inertia of the supercharger adding response to your engine.

Holes are cross drilled through the pulley and over each groove, to increase belt grip and reduce belt slippage as your belt stretches. Also incorporated into the design are oversized belt retainers, which reduces belts from jumping off.

Shaft Coupler Design

The ALTA Supercharger Pulley features a stainless steel coupler which clamps onto the supercharger shaft rather then wedging in place like other aftermarket pulleys. ALTA was the first pulley to use this clamp-on method, and it has proven to grip the supercharger shaft better than other aftermarket pulleys and it will work for those who have had other pulleys slip and cause damage to the supercharger shaft. Our hub will attach to supercharger shafts that have been worn down by as much as .020" and still work perfectly!

Additionally the ALTA pulley coupler features an open installation site aperture in end of our shaft coupler which allows you to visibly verify that the shaft collar is fully seated to the supercharger shaft.


The black outer pulley is machined on a lathe from solid billet aluminum. Since this part is perfectly symmetrical it is naturally balanced in itself.

The non-symetrical hub adaptor must be balanced to offset the weight of the clamping bolts and slit. In the machine shop we balanced our prototype pulley to within 0.1 gram at 16000RPM (even better than stock). Data from that balancing was added to the model and applied to all production parts ensuring the entire part is balanced.

Pulley Size

ALTA Supercharger Pulleys are offered in two sizes:
15% and 17% reductions.

15% Reduction

This reduction size is the market standard and produces smooth, safe power increases of around 20WHP.

17% Reduction

For those seeking a bit more power, the 17% is the ideal choice! Builds boost at a lower RPM giving you even more power down low where you need it, combined with another 1.5psi of boost at redline, it gives you the extra HP to conquer even the toughest challenge!

Belt Fitment

Here you'll find the correct belt required for your particular supercharger pulley setup.

Installation Tools

The ALTA Pulley Removal Tool is the perfect tool to reliably remove the factory supercharger pulley from your MINI Cooper S (tool does not work on JCW or GP pulleys).

You can purchase your own tool; perfect for club events or group installations.


In 2003 ALTA was the first manufacturer to design a two piece, taper fit Mini Cooper Supercharger Pulley (V1). Today, this is the most imitated design on the market. The current version of the ALTA pulley (V2) has taken pulley design to the next level. Installation is easier than ever, and the results are even more fantastic.

5 Year Warranty

ALTA Performance warrants to the original purchaser, all ALTA products to be free from defects in material and workmanship within a sixty (60) months period from the date of purchase. *Some exclusions apply
» Read Full Warranty

Off Road Use Only

This product is legal in California only for racing vehicles which may never be used upon a highway. Check your local and federal laws prior to installation!
» Learn More


Download Instructions

Warranty Details

This product features a 5 year warranty Read Full Warranty

Tech Department




Version 2.0 Body Aluminum 6061T6
Body finish Black anodized
Version 2.0 Hub 303 Stainless Steel
Bolts Grade 12.9 Socket Cap
Lock washers Grade 10.9 HI-Collar
Stock Pulley Weight 11.5 Oz
15% Pulley Weight 8.3 Oz
17% Pulley Weight 8.0 Oz

In The Box

In The Box

(1) ALTA Supercharger Pulley Hub
(1) ALTA Supercharger Pulley Body
(1) Allen Wrench
(5) Bolts & (5) Split Washers

Dyno Charts

Dyno Charts

Proven Horse Power

Cooper S, ALTA 15% Supercharger Pulley Test

Above is a test we did on our Stock Mini Cooper S to show the HP and TQ gains had by installing the ALTA 15% smaller Supercharger Pulley. The roughly 20WHP and 20ft-lbs of torque gained are huge, completely transforming the MINI into a new car! 17% SC pulley customers can expect roughly 2-3WHP more than you see here.

Compatibility Notes


2002-2006 Cooper S Hardtop Yes
2004-2008 Cooper S Cabrio Yes
JCW and GP Yes **
**SC Pulley fits, but ALTA pulley puller will not remove pulley as JCW and GP pulley is smaller than Cooper S.



Shipping Information

  • Item Requires Shipping
  • 2.0 lbs.
  • W6.0000” x H2.0000” x L6.0000”
  • Free Standard Shipping 2 to 10 Days
  • This item ships in its own box.