How about a turbo kit
Yes it is easy to go a step too far & there are people like the youtube guy in every community, but I dont think there are any people on here as dillusional as that guy.
A set of wheels are a simple mod, easily reversible & trust me the red lip will attract the right sort of attention.
Too many people play it safe IMO when it comes to the 350Z, most go for Nismo stuff (i'm not saying theres anything wrong with that) but modify YOUR car the way that YOU want it to look.
If I had listened to most peoples opinions I would have never bought my Volks & I wouldn't have gone for a single exhaust.