CnB

hi all

I being searching around for what parts i needed to do a S4 brake upgrade.
Am i correct that i only need
for the frontside

Calipers
Retaining spring
Carriers
brake pads
rotors
splash shield
bracket for brake line

Is the rear side necessary ? for Stage3 cars?
I being told you hard use your rear brakes anyway, so its not really a must.

Rear parts needed
calipers
carrier
brake pads
rotors


I have seen posts which said they only got the rotors, calipers and carriers.
So i am a bit confused with whats really needed and what not.
Want to do it right, but i do not want to make unnecessary costs either.

Thanks, and sorry for the noob questions.