read, i mentioned "dealer".
i remember a few importers such as garage R and MB motors were
giving warranty on cars u buy from them, provided the mods are also
carried out by the same place.
and that includes wadever brakes they sell.
on another note, i think authorized dealers such as MI do allow
customers to upgrade the brakes on their rex to brembos from the
sti. could be a more far fetched scenario though.