For me, it will vary.
Red 85 MKII: BPU (intake, exhaust, wheels, suspension, brakes, stereo, soon to be shifter).
Silver 81 MKI: Completely stock (everything under the hood, interior, stereo, etc). Have only changed out the shocks (Tokico HP's), will eventually do a minor suspension upgrade (81 Performance Package springs & swaybars (if I can ever find any), and PST bushings). May do a minor/simple exhaust upgrade (2.25" crush bend piping). This is the car that I'm trying to preserve & keep it as simple as possible, the MKII is the one that get's all of the nicer upgrades.
Red 85 MKII: BPU (intake, exhaust, wheels, suspension, brakes, stereo, soon to be shifter).
Silver 81 MKI: Completely stock (everything under the hood, interior, stereo, etc). Have only changed out the shocks (Tokico HP's), will eventually do a minor suspension upgrade (81 Performance Package springs & swaybars (if I can ever find any), and PST bushings). May do a minor/simple exhaust upgrade (2.25" crush bend piping). This is the car that I'm trying to preserve & keep it as simple as possible, the MKII is the one that get's all of the nicer upgrades.