HARBINGER Supercharger Kit

P2 Centrifugal Supercharger


Average power curve: 330 – 450 HP♠
(See performance specifications below for more information)

The Harbinger is our first centrifugal supercharger kit. It is a modern take to an affordable and reliable high performance option designed for the 6-cylinder BMW M50, M52, M54, S50, S52 & S54 engines. Meant for a daily street car that may also see occasional track use. The kit itself can support the Speedmaster P2 Centrifugal Supercharger.

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 Land Rover Defender (1997-2000).


Our first centrifugal supercharger kit, The Harbinger was developed in house by K.C. Design Concepts between 2020 – 2022 and finally released in 2023. Built out of air craft grade aluminum, the kit is based on the affordable Speedmaster P2 Centrifugal Supercharger, rated at 1150CFM and some 55,000 RPM ceiling from the manufacturer. The P2 Supercharger is a dry unit with no lubrication required. The Harbinger is a modern take to an reliable high performance solution for enthusiasts who want a compact and affordable centrifugal option for the BMW M50, M52, M54, S50, S52, S54 engines.

The Harbinger is ideal for a daily street car as well as a car that sees occasional track use. Currently available in its 2nd generation, this setup features our custom machined COG pulley and machine belt drive ensures the supercharger itself maintains a fixed ratio, limiting the supercharger to 30,500 RPM maximum while utilizing the factory belt drive, which allows you to preserve all the original stock belt driven engine accessories as the alternator, power steering, air conditioner, all in their original position.


  • Complete Set of Brackets
  • Inlet and outlet piping for the P2 Centrifugal Supercharger (Included with orders from fall 2023 onwards)
  • M5x Engine Throttle Body Relocation Manifolds
  • Full set of Gaskets (Included with orders from fall 2024 onwards)
  • Custom COG Machine Pulley, Belt Drive & Idler Pulleys
  • Full set of Fasteners (nuts, bolts and spacers)
  • Finished in Powder Coated Speed Yellow or Azur Blue colour (Supercharger Kit)
  • Guaranteed 36 months craftsmanship warranty covering occasional track use*
  • Supercharger Warranty 12 Months from Speedmaster Australia*


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



  • On the E46 and E38 and E39 you will be required to relocate your radiator reservoir or use a E36 or aftermarket radiator for space issues.
  • There are 2 different types of Speedmaster P2 Centrifugal Superchargers, Generation 1 and Generation 2. Variations include 2 mounting bolt holes that are moved 5mm away in the P2 Generation 2. Ensure to read through the notes to know which one you have, as our kit was originally designed for Generation 1. If you have a Generation 2 P2 Centrifugal Supercharger then you must either settle for not using the 2 bolt holes out of the 4 mounting holes we offer or drill 2 extra holes onto our bracket, slightly slotting it.
  • The Supercharger is not included in the kit unless ordered separately from us, you are advised to use the given part number for the supercharger and order the supercharger locally.
  • LF30 power steering pump and pulley from M52 or M54 engines
  • With the stock Hyde Motor Works 130mm Supercharger drive pulley, we recommend an an air to air intercooler and limiting the boost to under 10 PSI, using a boost controller and a bypass valve. For higher boost, you will have to rebuild the P2 Centrifugal Supercharger with new bearings and use any available Hyde Motor Works overdrive pulley made for the driving the P2 Centrifugal Supercharger. The stock engine should not be pushed beyond 10PSI.*


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

  • Speedmaster P2 Centrifugal Supercharger with recommended accessories (check the technical specifications for part numbers)
  • an Intercooler Kit with silicone pipes and hose clamps (can be sold separately)
  • LF30 power steering pump and pulley from M52 or M54 engines (if installing on the M50 with LF20 power steering pump)
  • vacuum hose
  • an high flow air filter
  • a boost gauge
  • a recirculating by pass valve and
  • boost controller (for stock engines)
  • 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 HARBINGER Supercharger Kit, please check the overview on Our Products page.

Additional information


Boost Depending on Supercharger
Maximum Boost 14PSI

Chassis Fitment & Engines

For all E34, E36, E38, E39 and E46, Z4, Z3 and E30 with M5x or S5x engine swaps. Supports all the 6 cylinder M50/M52/M54 or S50/S52/S54 motors


The Harbinger kit supports only the HB-1 / P2 unit, which is the Speedmaster P2 Centrifugal Supercharger (MPN: PCE157.1002).

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