I bought an LED kit for an R32 and they all fit fine. Didn't have issue with any weird sized bulb.
Need 'wide angle' type LEDs as you need the light to be spread throughout the cluster.
Yep I always recommend wiring in relays.
Also, headlight switch.
The R32 projectors are horrendous, you should look at doing a HID retrofit. Look here:
http://www.sau.com.au/forums/topic/93963-xenon-hid-lights-conversion-for-r32/
Was driving around tonight with the MOMO M2 tyres on the Pulsar (185/65/15 lol), way more grip than I expected, from an $80 tyre.
I'd definitely put the M3 (more grippier) tyres on my R31.
Standard gauge is mmHg, not psi. As per GTSBoy's response, 1bar causing the ECU to freak out.
No point pushing the standard turbo that hard anyway. Save up for an aftermarket option + ECU + tune, you'll be better off.