The Subaru Impreza WRX STi (GDB-D) is the flagship model of the second generation Subaru Impreza model.
In December 2000, Subaru updated the WRX to the second generation. The GDA WRX model also retained the 5-speed manual transmission gearbox design from the GC8. Subaru later released a new 6-speed gearbox for the STi model GDB that is significantly stronger.
The GD chassis along with the WRX and STI underwent two styling changes in its life cycle. The original styling applied to A and B. Initially this design proved to be rather unpopular which prompted a more conventional design for the applied C, D and E models. The second facelift applied to the F and G versions.
The WRX STi gained 17" x 7.5" alloy wheels over the previous 16" x 7" wheels. The 5 speed manual transmission (reputed to be one of the car's weak points) was changed to an STi engineered 6 speed manual transmission. The engine was retained from the Version 6 STi and still retains the semi-closed deck block and is still labelled as the EJ207, however the engines did gain Variable Valve Timing (AVCS) further improving their low-end torque production. The interior was updated with an STi logo on the gauge. The STi's tachometer also has a red shift light. The STi's and optioned Type RA STi have received Brembo 4 piston front and 2 piston rear brakes while the bare-bones Type RA STi still carried the Subaru 4 piston front and 2 piston rear brakes. Externally, the STis had larger hood scoops and had foglight covers with STi embossed on them. The DCCD was updated so it can work with anti-lock brakes. During braking, when the ABS is on, the DCCD will set itself to open-mode (no locking).
The version nomenclature was dropped from the name. Japanese and other auto-enthusiasts often refer to the chassis as GDB/GDF (the STi has a 'B' or 'F' (for USDM models) whereas the regular WRX had an 'A'). The fourth character of the VIN gives the revision (A to F where G is the 2007 version).
In 2000, most of Asia, Oceania and Europe received the new STi. The engine was detuned to meet emission standards. Engine output was variously rated from 265 PS (261 bhp; 195 kW) at 6,000 rpm and 343 N⋅m; 253 lbf⋅ft (35 kg⋅m) of torque at 4,000 rpm, to 280 PS (276 bhp; 206 kW) at 6,400 rpm and 373 N⋅m; 275 lbf⋅ft (38 kg⋅m) of torque at 4,000 rpm depending on market.
2005 STis received the long-awaited DCCD control available in other markets, as well as a slight wheelbase increase to match the Japanese-spec WRX STi Spec-C and has 280 PS (210 kW; 280 hp).
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