[purity]

Hi,
Does any body can help me with this question?
The price of the Brembo GT Kit for E46 M3 with 8 piston caliper is around $4000 while the GT kit for E90 with only 6 piston also have price around $4000.

So I was thinking if I buy the old E46 M3 8 piston Brembo GT Kit,can I fit it on the E90?
if have to modified what modification needed for it?
Does the rotor mounting need to be modified too or only the caliper adapter need to be modified for installing it on an E90?

Thanks