The guy was bagged because he failed to substantiate his statements and was obviously trying to make a quid out of gullible people.
IMHO, using the original calipers on a larger diameter disc means that more energy must be dissipated through the pad and caliper over a shorter period for substantially greater breaking efficiency.
The small area of AE86 pads means that you may well easily cook the pads.
A 12 mm disc will not be an effective heat sink initially nor will be able to dissipate heat effectively in this scenario.
A braking system should be considered as a balanced setup, you can't just change one element and assume to achieve a greater benefit without considering the other elements of the design and the balance required.
For those whinging about avatars and rep:
If you don't like it, bugger off somewhere else, as for avatars - Grow Up and Get A Life!

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