2017 Subaru Impreza

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Heavily modified version of the 2.5-litre ‘EJ25’ flat-four engine. In this guise it produces an estimated 336bhp - 31bhp up on the US market STI and 40bhp up on the STI Final Edition that was sold in the UK last year. STI has had to work hard to achieve these numbers - this is no simple ECU remap.

Starting with the engine’s internals, STI has fitted new forged pistons and connecting rods, and redesigned the intake. It also fitted larger injectors and a more effective fuel pump to get more air and fuel into the cylinders.

The turbo itself is new as well, designed and manufactured by HKS specifically for STI. The new unit has an eight per cent larger turbine, and six per cent larger compressor, and runs at a higher 18psi boost pressure (the standard STI runs 16.2psi). To keep the internals cool, a water-spray system, controlled via a paddle behind the steering wheel helps cool the larger intercooler.

The S209’s front and rear axles are 15mm wider, and fitted with electronically controlled locking differentials as well as an active centre differential, varying torque split between the wheels depending on the driver-mode selected on the centre console. The S209 also features power torque vectoring, which is again driven by the selected driver mode and data collected from the two axle-mounted differentials. The system can ascertain which of the four wheels is able to most effectively utilise the available power, distributing drive accordingly.

Subaru has uprated the Brembo brakes, the stopping setup now comprising six-piston front and two-piston rear calipers, with upgraded high-friction performance pads. These sit behind a new set of 19-inch forged BBS alloy wheels wrapped in Dunlop SportMaxx track-day tyres.

The STI S209’s bodywork is 48mm wider than standard, with stiffening beam cross members fitted underneath and a pillow-joint strut bar across the front axle which is longitudinally flexible but completely stiff laterally to improve the minute front suspension geometry without compromising suppleness. This is technology that’s been directly transferred from Subaru’s motorsport division. Beyond that, bespoke Bilstein dampers and stiffer springs complete the chassis tweaks, in the process creating one of the most thoroughly reworked limited edition Subaru STIs yet.

Outside, the S209 has also picked up a raft of new aesthetic upgrades, from the widened arch extensions, stacked rear wing and front-mounted canards.

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