Ewwwww... a bug
Welcome.
Mods really depend on budget and usage so give people a rough ideal what you are after:
- Catback exhaust, rear sway bar and lowered progressive springs are a good start for a budget daily.
- If you are lucky enough to have more money then you can always upgrade brake pads/disc/fluid, clutch, turbo, intercooler, injectors, downpipe and tune...
The best mod you can get is seat time
nothing more fun then going 110% on the track to learn the limits of your car.
Plenty of driveway threads to go through and see what mods/combinations have been used in the past with various results:
Your Driveway - Perth-WRX.com
I also found this one useful when looking at turbo/intercooler combinations so you can get an idea of what power is achievable :
Performance Thread - Perth-WRX.com