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Neither have I. Until this sparked curiosity. Then I found "TurboAir.com" Complete with a "10 on your side" Local News consumer watchdog schtick. It's everything I hate about local news.
That's the first time I've heard of one being on an RX-7. I found a similar one on a Corvette that I bought back in 2017. Removed it immediately and low and behold, the engine idled much better!