lot's....they hate summer for a start....much more so than RB's. FMIC, Nismo thermostat, additional trans cooler, phenolic spacer and regular oil changes should be at the top of your list for mod's...oh and get rid of the cat closest to the turbo ASAP....I reckon half the turbo problems with these are because the cat's 200mm's away from the turbo.
Biggest improvements are from getting a decent dump pipe with the exhaust, Suction pipe and FMIC!.....biggest improvement after that should be from the reflash when it happen's.......one of us has a Nismo ECU on the way as well !