I recently bought a near perfect R32 GTR from Queensland (import) for 25k to Adelaide anything less i would wonder on its authenticity , my car is still factory black underneath , also check deep within the engine and firewall , for heat damage , rubber on pedals , wear and tear on interior general , i would check if all ADRs have been done. I brought mine from Queensland to Adelaide and got caught out with interstate registration , dont know if its the same for ypur state but in S.A , its child restraint anchors , convex mirrors , tyre plackards , high mount stop light ,side intrusion bars (expensive) all windows should be plastic laminated glass to save weight same as subaru sti , check with glass people for code. Anohter thing to look out for is internal driver side and passenger side window runners , if theres any vertical scratches in the glass get it repaired before you buy , most importantly check all rubbers boot , bonnet , doors and windows - good guide to originalilty ..check all gauges work and dash lights . Check car is currently registered * important * Never heard of de-gassing GOODLUCK !!!!!!!!!!!!!!