blah blah how much power were you making? from what i have gatherd, if you dont break in your clutch properly (allowing the mating surfaces of the disc flywheel and pressure plate to resurface and wear properly during your break in procedure the clutch wont hold as much tq. Not to mention premature wear of the clutch slipping before the surfaces have aquired the same surface patturn.
its kinda similar to replacing\resurfacing your rotors and keeping your worn brake pads. the existing brake pads have surface grooves in them from the previous rotor creating high and low spots. When your brake pedal is depressed and you try to stop on the new rotors with the old pads, the whole brake pad surface area is not touching the rotor and wont stop the car to its full potential. If you dont wear your pressureplate, flywheel and clutch \ break your new clutch assembly in, the same thing can happen. Any high and low spots can wear into your friction componets more then you want "prematurly". These imperfections arent noticable on low power vehicals because the clutch was engineered to hold well over factory tq spec, but when you start making 200, 300 and 400% over factory tq spec the last thing you want is your power being lost in your clutch slipping.
this wasnt directed to you jdm ae86t, but a few people that i have spoken to recently belive that a brake in procedure is not nessacary, or unwarrented.
lets here what other people have to say about the topic, remember i drive and automatic so all of this clutch stuff is foreign, maybe im overlooking something.