Version IV (09/97 – 08/98) – GC8E Power remained at 280 PS but torque was raised from 253 lbs./ft of torque to 260. Forged pistons were also added. The interior and the cockpit were changed into a newer design along with the new "White color" gauges. (white faced)
Version V (09/98-08/99) – GC8F The power stayed the same as the previous version 280 PS. The engine layout and design was made cleaner and was dubbed as the Boxer Phase 2 engine. The facelift the rest of the Impreza line had was also applied to the STi. The WRX STi weighed 1,270 kg (2,800 lb). There were 1000 WRX Type RA STi Version 5 Limited cars and the WRX Type R STi Version 5 Limited cars had a 4 month waiting period for each order. The interior was also changed slightly from the Version 4 including seats and steering.This model was also produced as a 555 limited edition.
Version VI (09/99-08/00) – GC8G Most of the changes were cosmetic. The wing was sculpted to be more aggressive. VF28 spec turbo with max boost at 1.2 BAR and produced 224 kW (305 PS) and 388 Nm. There were 2000 WRX STi Version 6 Limited, 500 WRX STI Type R coupe Version 6 Limited and 2000 WRX STi RA Version 6 Limited cars produced. Also 500 WRX STi Version 6 Limited Hatchback models.