The Harbinger is our first centrifugal supercharger kit. It has been in development since 2020 by K.C. Design Concept.

The kit itself is based on a P2 centrifugal dry unit with no lubrication required, produced under Speedmaster Australia. The P2 is a readily available affordable supercharger rated at 1150CFM max and some 55,000 RPM from the manufacturer. Being a centrifugal supercharger setup, the package is very compact. Boost starts to build from the mid RPM range and continues to build up to the higher RPM range, while it allows for a cooler charge temperature.

Meant as an affordable and reliable upper mid range option for M5x and S5x enthusiasts who want a compact, reliable package that packs a good punch for engines under 3.2L. In the future, we will also offer an BMW N engine variant with this supercharger.

This setup will work for both stock and built engines. While a built engine will be able to handle more power, on a stock engine, we suggest limiting the boost to 10 PSI, using a boost controller and a bypass valve. Our custom machined COG pulley and belt drives the supercharger itself while maintaining a fixed ratio, limiting the supercharger to 30,500 RPM.