In the USA the only turbo car is the 2002-later WRX. However, there are tons of aftermarket kits for the last generation car.
What is it about the current model you don't like? If it's the front end that really turns you off, it's being changed. And there are certain things you could never upgrade on an older Impreza, such as Electronic Brake Distribution.
WRX ($24,000):
MECHANICAL
227-horsepower @ 6,000 rpm, 217 lb.-ft. of torque @ 4,000 rpm
2.0-liter intercooled and turbocharged 4-cylinder boxer engine
Full-time All-Wheel Drive (AWD)
Quick-ratio rack-and-pinion steering with engine-speed sensitive power assist
Viscous limited-slip rear differential
4-wheel fully independent sport-tuned suspension
SAFETY
Subaru All-Wheel Driving System
Front seat side-impact air bags (SRS)*
4-channel/4-sensor Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD
EXTERIOR
Aluminum-alloy hood with functional hood scoop
Redesigned front end with multi-reflector halogen headlights and projector beam halogen foglights
Front and rear fender flares
Redesigned rear end with new taillight and bumper design
16-inch aluminum-alloy wheels with 205/55 R16 all-season radials
INTERIOR
Leather-wrapped MOMO steering wheel
Performance design reclining front bucket seats with integrated head
AM/FM stereo with logic control cassette, 6-disc in-dash CD changer and six speakers
WRX Sti ($31,000):
MECHANICAL
300-horsepower @ 6,000 rpm, 300 lb.-ft. of torque @ 4,000 rpm
2.5-liter intercooled and turbocharged 4-cylinder boxer engine with Active Valve Control System (AVCS)
Full-time All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD)
Mechanical limited-slip rear differential
Suretrac viscous limited slip front differential
4-wheel fully independent sport-tuned suspension with inverted struts
6-speed manual transmission with short-throw shifter
SAFETY
Subaru All-Wheel Driving System
Front seat side-impact air bags (SRS)*
Brembo braking system with 4-wheel disks
Super Sport Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD)
EXTERIOR
Front bumper corner spoilers, rear trunk spoiler, STi side ground effects
High Intensity Discharge (HID) headlights
17-inch BBS aluminum-alloy wheels with 225/45 R17 summer radials
INTERIOR
Leather-wrapped STi MOMO brand steering wheel
Performance design reclining front bucket seats with integrated head restraints.