There is one set of early aluminum arms that have NA bolt pattern, but the rest all have same turbo pattern.
Braking will be the same with both piston types. (they just have different type of seal set-up) But some models had different piston sizes on front, they could be 44&38mm MO30 option or 40&36mm. ALL rear turbo's have 30&28mm pistons. If your asking about braking with turbo vs. NA. Turbo is overkill for T1, but I like "the look"
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG