Top 4 things i would look out for on a test drive:
1. test if the clutch can hold power under acceleration, make sure it's not slipping/revving too high without the equivalent acceleration
2. test the Anti-lock Braking System. drive down a quiet residential street at about 30-40km/h and slam on the brakes fairly hard and abrupt so the ABS kicks in (warning: make sure no cars behind, and let the owner know what you're about to do first! ) You should a) stop very quickly and B) feel the brake pedal pulsing under your foot as the ABS is doing its magic
3. LISTEN for any rattling or knocking sound coming from under or to the rear of the the car, any whining noises from the engine bay, or other unusual sounds.
4. Take the car up to around 90-100, see if there is any shaking or wobbling of the steering wheel. You will know it if there's a major problem with suspension, etc.
But if you're taking a GTR R34 for a joy ride with no intention of buying then disregard the above and just boost her up and let it rip, enjoy the ride :headspin: