One of the FC model RX-7's had higher flowing injectors.. 520 or 550 I believe. You need to read up on it online though so you know how to properly identify them as another model uses much smaller injectors which look the same (might even have had the same part number if you can believe it). That's the only one I know of. Everything else is going to require a custom fuel rail and possibly some work on the head.
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