Upgrading from 4 piston willwood brakes to 6piston, is it worth it?

[para67camaro]

I am going to ship my car to Germany and I am concerned with slowing down from 160mph to 80mph, maybe even more, on the Autobahn. I have heard that it is a concern with cars out there, the traffic jams in Germany come out of no where and I noticed I was slowing down from 260k to about 100k or slower at times. Would jumping to the 6 piston brake, same rotor, be that much more advantageous or is it not worth the money.