It could be the mid-ship bearing that lies near the middle of the driveshaft. They will cause a drone when they get worn out.
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2014 FR-S Monogram Series, Raven Black, MT
Mods -ARP wheel studs, Bilstein B6, Michelin Pilot Sport 4S, Diode Dynamics "Tail-as-Turn" kit
Future Planned Mods - Ace 350 Header & Tune. Oil cooler.
Fuel Economy - Best was 37.2 mpg, Worst was 28.2 mpg
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