the many more 4AGZE questions topic

[NoHachi]

I have some suggestions:

Your current thinking about brake setups will change with real power/grip/speed.

For example, I have a stock powered MX5 using stock brakes with Yellowstuff pads. My braking decelleration G's are on par with MX5 cup cars, so she stops nicely on track. No pad fade, no problems whatsoever. I've been on this set of pads for maybe 15 trackdays and 2 years of daily driving. Pads still have life left and discs are OK.

My friends drive MX5 turbo's at approx 250bhp@wheels. They are now in the 1m:52s at Zolder. They can now disintegrate a set of pads and discs in a single day at zolder or other heavy braking circuit. So now other things become important, mostly:
How long do my pads and discs last?
How much does it cost to replace them?

Going custom discs can be a problem on that front, going AP calipers too. If you size the whole thing large enough you should be able to get the discs to last. Going two piece with aluminium hats will shave some weight and save money when you only have to change friction discs. Check beforehand how much real pads will costs and take that into account. Things like Carbone Lorraine.

Which rim size will you be running? 14s or 13s? Be prepared to take a beating on disc replacement if you go 13 and get fast :-)