94 miata 1.3L i4 engine swap origin?

on the 94 hardtop miata, does anyone know what the 1.3L i4 swap comes from? my assumption would be that its a bike engine but idk superbikes well enough to know what it could be

According to this list it’s from the Sierra RX3:

Oh, i thought it was a Hayabusa engine

Well, you’re right that it is, the Sierra RX3 is powered by the Hayabusa engine. Forza mentions it as the RX3 engine as that’s how it’s featured in the game.

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Which means it’ll be a Suzuki GSX1300R/Hayabusa engine

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Same here.