Subaru will display three new special edition Impreza WRX vehicles at this week’s London Motor Show, including a brand new concept version dubbed the WRX STI 380S. The car’s name refers to its 380 metric horsepower rating, which translates to a final output of 375hp (280kW), and depending on its reception at the London event could enter limited production within six months.

The STI 380S includes a complete engine rebuild by British tuner and motorsports company Prodrive, as well as an uprated suspension and exhaust system and enhanced bodykit.

Also on show will be the new WRX-S, which sports a more powerful 252hp (182kW) version of the familiar turbocharged boxer engine in the standard WRX. With the extra power on-board, the WRX-S will be able to sprint from 0-60mph in just 5.5 seconds and reach a top speed of 130mph.

The third model is the Impreza WRX STI 330S (pictured). Its output will be rated at 325hp (243kW) when the car arrives in UK showrooms this September. Top speed is the same 155.3mph as the current STI but the 0-60 mph time drops from 4.8 seconds to 4.4 seconds.

All the cars have been tweaked by Prodrive and are differentiated by their extra power outputs and unique styling elements. Some of the changes include a new recalibrated ECU and a modified exhaust system. Visual changes include anthracite GT1 alloy wheels, a new grille and rear wing. Standard equipment includes a Momo gearknob, a rear diffuser, leather covered steering wheel, a rear limited-slip differential with Subaru Vehicle Dynamics Control and xenon headlights. Subaru is yet to reveal if there are plans to offer similar models outside the UK.

Subaru Impreza WRX-S and WRX STI 330S