I had a brief stint regarding cars. I have a 2000 Jetta VR6. I had pipe dreams about installing some 'dubs' and practically rice out my car. However...on the Jetta...things are just too expensive.
Sure would like to put a 6 - stage turbo on my engine
But...my reasonable mods would be:
1) sway bar in the rear to correct the over steer.
2) Get at least 17 inch rims with some good all weather sports tires.
3) Change out the pulleys for some light weight alluminum ones.
4) Finally...I think I would get a back cat exhuast system.
There ya go.