Genuine Toyota part! Apparently proven to be a functional addition
http://www.ebay.com/itm/2012-TOYOTA-86-ZN6-SCION-FR-S-GENUINE-REAR-PILLAR-AERO-STABILIZING-FIN-EPDM-JDM-/270981100067?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f17bb7223&vxp=mtr
Whatever next
Edit:
if you search the seller for <h1 ="vi-is1-titleH1">TOYOTA 86 ZN6</h1>
There are many more JDM goodies too.
Edited by: Pablo

http://www.ebay.com/itm/2012-TOYOTA-86-ZN6-SCION-FR-S-GENUINE-REAR-PILLAR-AERO-STABILIZING-FIN-EPDM-JDM-/270981100067?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f17bb7223&vxp=mtr
Whatever next

Edit:
if you search the seller for <h1 ="vi-is1-titleH1">TOYOTA 86 ZN6</h1>
There are many more JDM goodies too.
Edited by: Pablo