phase 1 was the original nsx-gt, that was based off of the le mans winning nsx gt2
phase 2 was the updated version, with a different transmission that was mounted differently + added a mini air scoop on top
phase 3 was the last of the original gt2 based chassis’s, and were the first to have their engines longitudually mounted and have new headlights + brand new air scoop
phase 4 used a brand new chassis based off the NSX-R GT model, and were much wider + a new, larger engine (3.0L C30A twin turbo-> 3.5L C32B NA)
phase 5 was the final form of the nsx, which had the rear spoiler, the rear arches, the front facia, and the width changed
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if you want a visual history here you go (only goes up to 2020 though)
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Wow thanks for the explanation, I’m enlightened!
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