It is a turbocharged version of the Subaru Impreza available as a 4-door passenger, 4-wheel drive sedan or station wagon version.
In Japanese market, it was launched in 1992. It was also introduced in Europe, Australia and New Zealand in later years. The Impreza WRX initially launched with a turbocharged 2.0-L engine later upgraded to 2.5-L flat-4 Subaru’s EJ series Boxer engine. It features wider wheels with low profile tires, relatively larger brakes, and relatively stiffer and fine quality suspension units.
It was launched in North American as a 2002 model year in 2001.
First Generation (GC chassis; 1992-2000)
In Japan, total of seven models of the Impreza WRX have been produced by Subaru. Normally, the STI versions were sold with sequential numerals. However, chassis code could also be a good way to verify the WRX version. Almost all the versions marketed from 1992 to 2000 have the chassis code starting with GC8 (for sedan) and GF8 (for hatchback) followed by an alphabetical letter.
Second Generation (GD chassis; 2001-2007)
The second generation WRX was launched with a complete redesign. Torsional hardness or rigidity of the chassis was increased twofold. In many markets, the consecutive numbers were discontinued from the version name, however, these were still be used in the markets including Japan, Australia and New Zealand. In order to determine the version, GDA nomenclature is used (where WRX referred with A while STI referred with B). The years are represented by alphabetical letters, i.e. ‘A’ being used for the debut year and ‘G’ represents 2007 version. The GGA chassis code is used for wagon versions.
Third Generation (GE/GH chassis; 2008-present)
The third generation WRX once again redesigned for the 2008 MY. This generation is built on a shortened Legacy platform. The new generation brings a change in Subaru’s aging traditions regarding style and design. It features full framed doors and also offers a hatchback body style for both WRX and STI models. An attempt has been made by Subaru to reduce the weight of their new chassis. The Subaru has succeeded in their efforts of keeping the weight on lower side without compromising the rigidness, size, and safety of the new generation WRX. The new chassis stands at 1425 kg (3142 lb) for a 5-speed manual version and 1455 kg (3208 lb) for a 4-speed automatic version.
Subaru still retained EJ255 engine for the new WRX. The front suspension is based on MacPherson struts with a steering ratio of 15:1 and rear receives the new double wishbone suspension. As for US based WRX, the company decided to return to a 2-piston/1-piston sliding calipers instead of continuing with a 4-piston/2-piston fixed caliper arrangement. However, it has gained some size on front as well as rear, i.e. 11.6 inch (295 mm) and 11.3 inch (287 mm) respectively. The specifications are pretty much identical to the US based Legacy 2.5i built on BL5 chassis.