Benefits of gti6 brakes

[Grant]

Lots of talk about upping the size of front brakes or putting gti6 brakes on but as anyone considered 406 hdi brakes? or am I missing something? They're the same size as gti6 up front but they appear a good bit bigger on the back. Are the 306's too light on the tail for the bigger rear bakes?

IIRC Dum-Dum did this.

They benefit from a larger piston size in the front callipers from memory.