The thing about that though is the Zed is getting on a bit now especially the one's like mine, early DE engine models.
At the time when they were new they were a fast sports GT car with quoted 0-60mph of 5.9secs but nowadays that doesn't seem so fast when there are so many of these hot hatches & turbo/supercharged this & that which can match or better it with ease.
I think though in the end "real drivers" who enjoy speed (like me) will always just get used to what they have and crave more power, more speed, better performance etc.
I'm sure that if I had an R35 GTR which is what I lust after. Give it a year or so and I'd want that to be faster, stop quicker etc.
Edit: Spelling.
Sadly I agree with what you have said about the Z
On the GTR front, you may be pleasantly surprised... You get used to the speed and acceleration, but you rarely use that much power on the road. So you may get used to it, but when you do take it on track it still surprises you!! I have had 600hp from 3 months and I am happy to say that is enough. Suspension is great, just need to sort the brakes.... stock is good for road, but not great on track, the aftermarket discs and pads are ok, but I dont think they are that great. Alcon BBK kit is the way but that comes with a substantial pricetag.
Mine currently has the boost turned down, so I get a lovely surprise in spring when the roads become dry