I have had thoughts about selling my car as well Marko, the resale value is just not there + think about all the time, effort, blood and sweat poured into that thing. You will never get it back. I have decided to keep mine and just make it a little bit better.
Try any of the recommended workshops from the sticky section. Boostworx, fours and more, morpowa, southern hi tech dyno, graham west workshop just to name a few off the top.
I thought about that, might give that a go first to see if it does quiten it down. Its pretty loud as is, which is why I am afraid it won't go below the legal limit.
And what are the police doing about this, pretty much sfa.
Piere did your mate have insurance, looks like a nice clean ride mate. Hope it turns up in a good condition and the insurance companies are easy to deal with.
Goodluck
I don't think a custom made rad would be an issue. As long as it goes in the same spot as the stock rad. Give regency a call and clear it up with them.
I have been using a clutch I bought off ebay for almost 2.5 years now. Car has made close to 300 rwkw and done 4 track days. Clutch is still going all strong. I paid something like $300 delivered. Below is a link for something similar. Get the Stage 4 clutch and it feels no different to a stock clutch.
http://www.ebay.com.au/itm/F1-RACING-6-PUCK-CERAMIC-MIBA-STAGE-3-CLUTCH-DISC-JDM-NISSAN-SKYLINE-R31-R32-R33-/160707735886?pt=Motors_Car_Truck_Parts_Accessories&hash=item256aed714e