Just a quick comment about the 1979/1985 1st gen RX-7 Mazdamotorsports brake ducts. As shown in the old Mazdamotorsports book the ducts favor forcing the air towards the center of the rotor where most of the air escapes through the vented rotor which cools both sides of the rotor. I presume the 1986/1991 RX-7 ducts from Mazda are fabed the same way. If this will work better tham the others shown in this thread I can't answer but I can tell you that I had them on a 1st gen & I never had a hot brake issue/fading pedal again.
Have Fun ; )
David Dewhurst
CenDiv Milwaukee Region
Spec Miata #14
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