Where did you get that info from? I can't see the rev-up weighing 90kg (~6%) more than the non?
My350z website, that weight is over the entire car, not just the engine, sorry, badly worded on my behalf!
Im pretty sure all the zeds weigh roughly the same, regardless of which year. The only ones which weigh a lot more are the roadsters.
Apparently: Copied and pasted
03-05
Coupe:
3,188 lb (Base)
3,197 lb (Enth)
3,217 lb (Perf)
3,247 lb (Tour)
3,225 lb (Track)
Roadster:
3,428 lb (Enth)
3,462 lb (Tour) Coupe:
3,339 lb (Base)
3,346 lb (Enth)
3,400 lb (Tour)
3,404 lb (Grand)
TBD (NISMO)
06-07
Coupe:
3,339 lb (Base)
3,346 lb (Enth)
3,400 lb (Tour)
3,404 lb (Grand)
TBD (NISMO)
Roadster:
3,580 lb (Enth)
3,600 lb (Tour)
3,602 lb (Grand)
Obviously from the US so they have different trim levels, but base to base or tour to tour etc, roughly 150+ lbs difference!