vs.

Stock GSL-SE Rotors @ 9.8"

Wilwood Dynalite 4 piston alum. calipers and Wilwood 12" rotors will fit inside 15" wheels on the front of my RX-7. You also have to install a Titon dual master cylinder to get proper brake balance. It will cost about $1000 for the parts you can buy, plus you will have to custom make brackets to mount the calipers on the Mazda strut. You will have to machine your old Mazda rotors down to just a plain hub, and bolt the Wilwood rotors to the Mazda hub. If you already had drawings of what needed to be machined, a machine shop could do the custom machine work for approximately $750. If you have to pay someone else to design and draft the parts you need machined, then it will be even more $$$.
The Wilwood brakes are awesome and do not fade out even under the most severe road racing use. Been there, done that - Tom

You machine most of the rotor off your hub. The Mazda rotor is ventilated: an outer face you see, the center vanes, and an inner face. Machine off all of the inner face and all of the vanes. Turn the outer face down to about 7.9" OD. The backside of what was the outer face must be machined perfectly smooth and flat relative to the axis of the wheel bearings. This is the surface you will bolt the Wilwood rotor onto. Drill a bolt circle with the following specs: 8 holes .328" dia equal spaced on a 7.000" circle thru what was the Mazda rotor outer face. Use the Wilwood rotors that are 11.875" OD x 0.813" thick, that have the 8 mounting holes on a 7.000" bolt circle. Sorry I cannot remember the part number. To get everything to work right, you must do everything I said in the first post: Tilton dual master cylinder and Wilwood calipers. The $49 rotors and $89 calipers are inexpensive, but you better plan on this costing you at least $1000 plus lots of labor by the time you get everything done - Tom