Preorder Sale!

B.R.O.S.K. 1 Supercharger Kit

C30 & C38 Supercharger


Average power curve: 380 – 500 HP♠
(See performance specifications below for more information)

The B.R.O.S.K. 1 was built for the race track. This light weight bolt on state of the art supercharger kit is CNC machined out of aircraft grade aluminum and designed for the 6-cylinder BMW M50, M52, M54, S50, S52 & S54 Engines. The kit itself can support either a Rotrex C30 / C38 / C38R which can also be sold together with required accessories.

This supercharger system supports a wide range of classic and Neo-modern BMW models such as the BMW E34, E36, E38, E39, E46, E83 X3, E85, E53 X5, E60, E61, E65, E66, Z3, Z4 models as well as Wiesmann MF 30 (2000- 2002) and  1997-2000 Land Rover Defender (1997 – 2000).**

Pre-Order Product: This product is available on a special Pre Order discounted price. A minimum deposit of 50% is required for us to accept your pre order, the remainder can be paid when we are ready to ship. The estimated time frame of delivery is Late May – Mid June 2024.
All terms and conditions apply. Contact us directly for any questions.


The BMW Rotrex Supercharger Kit 1, in short B.R.O.S.K. 1 was developed in Denmark by Mas Schandorph of Mas Motorsport Wiring in 2022. Capable of remarkable power gains up to 150% over the stock engine and nearing performance output only possible from our flagship M1 REV 2. This peak performance is due to the B.R.O.S.K. 1 being based around the incredibly efficient Rotrex Superchargers, the B.R.O.S.K. 1 Supercharger Kit is built for the BMW M50, M52, M54, S50, S52, S54 engines.

The B.R.O.S.K. 1 Supercharger Kit is ideal for track and race cars and utilizes the factory air conditioner position and belt drive, which allows you to preserve all the original stock belt driven engine accessories as the alternator, power steering, all in their original position.


  • Complete Set of Brackets
  • Rotrex C30/C38/C38R Supercharger (If ordered with the kit)
  • Pulley of Choice + Oil cooler + Oil kit + Hose kit + 1L of Rotrex Oil (If ordering a Rotrex C30/C38/C38R Supercharger with the kit)
  • Inlet and outlet silicone hoses & pipes set for the Rotrex C30/C38/C38R Supercharger (Included with orders from fall 2024 onwards)
  • Custom Belt Drive, 8 Rib secondary Crank Drive Pulley
  • Tensioner & Idler Pulleys
  • Full set of Fasteners (nuts, bolts and spacers)
  • Finished in Fine Brushed Aluminum (Supercharger Kit)
  • Guaranteed 24 months craftsmanship warranty covering full track use*
  • Supercharger Warranty 12 Months from Rotrex** (When purchased through us)


Supported BMW models & cars due to using 6-cylinder BMW M50, M52, M54, S50, S52, S54 engines:

  • 1990-1992 E34 520i
  • 1991-1995 E36 320i
  • 1992-1994 E36 320i
  • 1992-1996 E34 520i
  • 1993-1995 E36 325iA/2.4
  • 1992-1996 E34 525iA/2.4
  • 1990-1992 E34 525i, 525ix
  • 1991-1992 E36 325i, 325is
  • 1993-1995 E36 325i, 325is
  • 1992-1996 E34 525i, 525ix
  • 1992-1995 E36 M3
  • 1994-1995 E36 M3
  • 1995-1999 E36 M3
  • 1996-2000 Z3 M Coupe and M Roadster
  • 1994-1998 E36 320i
  • 1995-1998 E39 520i
  • 1998-2000 E46 320i, 320Ci
  • 1998-2000 E39 520i
  • 1999-2000 E36/7 Z3 2.0i
  • 1995-1998 E36 323i
  • 1995-2000 E36/5 323ti
  • 1995-1998 E39 523i
  • 1998-2000 E46 323i, 323Ci
  • 1998-2000 E39 523i
  • 1998-2000 E36/7 Z3 2.3i
  • 1995-1999 E36 328i, 328is
  • 1995-1998 E39 528i
  • 1995-1998 E38 728i, 728iL
  • 1997-1998 E36/7 Z3 2.8
  • 1997-2000 Land Rover Defender
  • 1998-2000 E46 328i, 328Ci
  • 1998-2000 E36/7/8 Z3 2.8
  • 1998-2000 E39 528i
  • 1998-2000 E38 728i
  • 1996-1999 E36 M3 (Canada and US only)
  • 1998-2000 E36/7/8 Z3M
  • 2000–2006 E46 320i, 320Ci
  • 2000–2003 E39 520i
  • 2000–2002 E36/7 Z3 2.2i
  • 2003–2005 E85 Z4 2.2i
  • 2003–2005 E60/E61 520i
  • 2000–2002 E36/7 Z3 2.5i
  • 2000–2006 E46 325i, 325xi, 325Ci
  • 2000–2004 E46/5 325ti
  • 2000–2004 E39 525i
  • 2003–2005 E60/E61 525i, 525xi
  • 2003–2006 E83 X3 2.5i
  • 2002–2005 E85 Z4 2.5i
  • 2000–2006 E46 330i, 330xi, 330Ci
  • 2000–2004 E39 530i
  • 2000–2002 E36/7 Z3 3.0i
  • 2003–2005 E60 530i
  • 2002–2005 E85 Z4 3.0i
  • 2003–2006 E83 X3 3.0i
  • 2000–2006 E53 X5 3.0i
  • 2002–2005 E65/E66 730i, 730Li
  • 2000–2002 Wiesmann MF 30
  • 2000–2006 E46 M3
  • 2000–2002 E36/7 Z3 M Roadster, E36/8 M Coupé
  • 2002–2011 Wiesmann MF 3 Roadster
  • 2006–2008 E85 Z4 M Roadster, E86 Z4 M Coupé
  • 2003 E46 M3 CSL
  • 2009 Wiesmann MF 3 Roadster 20th Anniversary Edition



  • The Supercharger is not included in the kit unless ordered, if buying the Supercharger as a bundled option with our kit, you can let us know the pulley size you wish to have.  If you are an existing client, you can email us to order the supercharger separately. Otherwise, you are advised to use the given part number for the supercharger and order the supercharger locally.
  • To use the full potential of the larger Rotrex Superchargers, the engine must be built to hold high boost, the stock engine should not be pushed beyond 10PSI.*
  • Rotrex Supercharger comes with its separate 1 Year Warranty covered by Rotrex**
  • B.R.O.S.K. 1 Supercharger Kit will require the Air Conditioner / AC unit to be deleted.


To complete the installation on any of the setups, you will also require the following additional parts:

  • Rotrex C30/C38/C38R Supercharger with recommended accessories (Sold separately with Rotrex based kits, check the technical specifications for part numbers)
  • an Intercooler Kit with silicone pipes and hose clamps (can be sold separately)
  • on the M54 and S54 engines, you will be required to use the M52 crank pulley.
  • vacuum hose
  • an high flow air filter
  • a boost gauge
  • a recirculating by pass valve and
  • proper tune.


Please consult the installation guide for more information.

For Tuning, We recommend using any of our selected tuner partners.
Tuning Packages may also be offered in our shop.

Please check our Product Finder for all parts available in our shop necessary for this setup.
For more information on the B.R.O.S.K. 1 Supercharger Kit, please check the overview on Our Products page.

Additional information

Weight12 kg

Boost Depending on Supercharger

Rotrex C30: 7-9PSI
Rotrex C38: 10-15PSI

Chassis Fitment & Engines

BMW M50, M52, M54, S50, S52, S54 engines with different variations that are commonly found the BMW E34, E36, E38, E39, E46, E83 X3, E85, E53 X5, E60, E61, E65, E66, Z3, Z4 models as well as Wiesmann MF 30 (2000- 2002) and  1997-2000 Land Rover Defender (1997 – 2000).**


Highest boost and power is projected based on the highest variant of the respective Rotrex Supercharger with a custom oversized crank drive pulley.*

Not all models of chassis have been tested, if you would like to check with us your chassis measurements before buying, please email us.**

When Installing on the M54, M50 or S50, S54 Engines, kindly use the following parts.****

BMW M52 Crank Pulley adapter Part #11211726449
BMW M52 Spacer Part #11231288660
BMW M52 Crank Bolt Part #11211720633 

1 Year Warranty on Rotrex Supercharger directly from Rotrex*****