The WRX STI 380S, as its name implies, pumps out a whopping 380 PS, or 375 horsepower in U.S.-style numbers.
Subaru's longtime motorsports and WRC collaborator Prodrive did a complete engine rebuild to squeeze maximum output from the flat-four. Subaru also has upgraded the suspension and exhaust system, fitted a full-on aero body kit and added 245/40R-18 performance tires on gold- or silver-colored BBS alloy wheels.
Subaru says it will finalize specs on the STI 380S "following customer input" and plans to begin hand-building the car to order by year's end.
Also on display here is another Prodrive-modified Impreza, due to reach U.K. dealers in September. The 251-hp Impreza WRX-S is priced at $45,200. A more potent 325-hp WRX STI 330S is also slated to appear in showrooms about the same time, priced at $60,250.
The WRX-S gets a modified ECU and exhaust system, and its 2.5-liter flat-four engine now delivers 288 lb-ft of torque. Top speed remains 130 mph, but 0-to-60-mph acceleration is trimmed to 5.5 seconds. The car gets STI body bits and rides on 225/40R-18 tires and anthracite alloy wheels.
The top WRX STI 330S has twin stainless-steel exhaust pipes and a reprogrammed ECU, with torque climbing to 347 lb-ft and the 0-to-60-mph time slashed to 4.8 seconds. Top speed is 155 mph.
Upgrades from the standard STI include Recaro leather seats, satellite navigation, keyless entry, push-button start and 18-inch alloy wheels and performance tires.
What this means to you: Subaru seems intent on milking the WRX franchise for all it's worth, at least in the U.K. — Paul Lienert, Correspondent

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