On most cars I'd agree on going base if you're going to mod, since most of the parts that differ are the parts you'll swap out anyways. With the Z though, it's kind of a toss-up, because you get Nismo's front configuration (the nose and undertray layout) which is a little bit different than the base, and seems like a better aero design to boot if you're tracking. I'm not sure if it's possible to retrofit, or exactly how many non-obvious parts under there differ (e.g. the little plastic bits in front of the wheel wells that the undercover attaches to, etc?). Obviously the rear wing differs too, but that's relatively easy to swap for if you care.
But yeah the Nismo exhaust/suspension/etc upgrades, you're going to eventually toss those.
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