SOLVED! Thank you, it was driving me nuts.
I'm betting on 13B because of the O2 sensor bung and flanges. I couldn't tell year or generation RX-7.
Ah, right, thank you! It was bugging be because I absolutely should've been able to recognize it, and I knew I should have, but I couldn't place it. It's been *years* since I dealt with a non-turbo rotary exhaust.
To the scrap heap it goes.
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