Scion FR-S and Subaru BRZ owners get a boost with news of the new HKS Supercharger kit.

Respected Japanese tuner HKS has released its Supercharger kit (GTS7040L) for the Scion FR-S and Subaru BRZ.

The new kit boots power and torque by a claimed 30 per and takes around five hours to install. Dyno testing shows that the supercharger will ramp up power from 157 horsepower to 235 horsepower, giving the two acclaimed sports cars the extra power many claim its chassis can handle comfortably. With the kit fitted, max power is delivered lower down the rev range at 6300rpm, instead of 6800rpm in standard trim.

The only structural modification requires moving the radiator frame to allow for room to mount the boost pipe. The kit includes a supercharger assembly, traction oil, installation bracket, suction pipe and blow off, intercooler assembly, intercooler pipe, an ECU adjustment and additional bracket parts. For those that want even more power, it is thought that the power plant could be pushed up to 400hp with additional modifications.

Currently, the HKS kit is on backorder in Japan, which gives an insight into the appetite for additional grunt from customers of the two sports cars. At this time, neither Toyota nor Subaru have indicated that they have any plans to offer factory-fitted turbo or superchargers to the FR-S or BRZ. Apparently, this is largely because the two companies aimed to deliver a fun to drive sports car below $25k and want to keep it that way.

The HKS Supercharger kit is retailing in Japan for around $6000. However, it will need undergo further emissions testing and modification so that it passes U.S. laws before it can go on sale legally.