no secrets but it really depends on what your application.
For my racing I use Project Mu race pads or Winmax W5. and used the shoes material the HQ racing guys use with the steel drums instead of aluminium. Sacrifice some weight in the drums because the aluminium expand too quickly with the heat.
If you can upgrade and put a bit of big brake kit bling on why not?
But is it a necessity? I'd say not.
I regularly do 195khp to 95kph stop at Sandown on stock front and rear drum for 8 laps race with no issue.
It took a while to find the right pads and shoes/drum to use. I tried too agressive pads and they cooked the rotors so by lap 3 there were massive brake fade.
p.s last year we have been allowed slighlty thicker and ventilated discs from non-turbo 300zx and allowed to put a spacer to expand the stock caliper to fit the wider discs
Mainly done for race car especially cars with very stiff spring rate, the higher the spring rate a small change in height would cause a much bigger imbalance in weight distribution.
A very cost effective way to get LSD r180.
the old school 4.4 or 4.1 $600 if you can get them
get a KAAZ LSD $1500
labour to install LSD into diff $300