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It's most likely a combination of the port and the exhaust. Even bone-stock cars with open exhaust will experience a rise in boost pressure, that's why something to control the fuel with is highly recommended even with only bolt-ons.
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-Ted
-1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status.
-1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.
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