1998.1 : V-limited
The WRX typeRA STi4 V-limited package included auto air conditioning, power window, powered door locks, electric door mirrors, quick steering gear box, front helical LSD. The WRX typeR V-limited package included STi engine is the same as the type-R STi, ABS, fog lamps, auto airconditioning, power window, center door locks, electric door mirrors. But it does not have a intercooler water splay.
The WRX type-R STi V-limited package is the same as standard type-R STi except the emblems and body color.
1996. 8 : Impreza WRX & Impreza WRX STi−3 [ Type-D ]
The BOXER-MASTER4 FJ20 engine was improved. The engine used molybdenum coating low-friction pistons, multi-point injection system, IHI RHF5HB turbine, and large size intercooler. And there was a mild facelift for the WRX with new front and rear bumpers, new headlight and taillight design and a new grille. And added the SRS airbag. As for WRX STi type-RA, braking performance was improved by using 16 inches 4-pot caliper at the front and 15 inches 2-pot caliper at the rear.
Horsepower 280ps/6500rpm torque 33.5kg-m/4000rpm (WRX, WRX-typeRA)
Horsepower 240ps/6000rpm torque 31.0kg-m/3000rpm (wagon)
Horsepower 280ps/6500rpm torque 35.0kg-m/4000rpm(STi version)
more info here scoobypedia