What kind of power is ur car pushing?
How many pots are u currently running?
Brakes consist of many components?
Will a steel braided hose be suffice?
If u change to more pots and larger pistons, can u rims accomodate
the new rotor and calipers?
U will have to have the adaptors and bolts to fit the new set
up.
When u mention a complete set at 4K, is it the front only?
If so, u gotta look at the brake bias as well.
2 cents worth before this thread gets outta hand.