If you are like me you are poor
Essentially what I wanted to do was get the most stopping power i could without swapping to the 5 lug and without changing out of my stock wheels. I do love the tear drops for some reason...
My brake upgrade consists of J30 calipers and 03 sentra SE-R rotors.
From the stock 10 inch rotor you go to a larger 11 inch rotor and the small one piston calipers are replaced by larger J30 two pistons (I'm sure the Z32 4 pistons will fit and bolt on the J30 lower bracket.) The main problem with the old way of swapping to J30 brakes was drilling the J30 rotors ( people do it) to the Four lug or swapping to the 5 lug hub. I didn't want to buy new wheels and the new hubs.

So what you need to do
-lube the j30 sliderpins if you get them from the ol' J-yard
-remove old calipers, pads, and rotors.
-remove the hub (30mm bolt) to get to the dust shield
-remove the dust shield
-pack the bearings and replace hub, they're probably going to need it
-Fit on your 4 lug sentra SE-R rotor (Basically a 4 lug j30 rotor)
-Bolt the J30 calipers on, same bolt holes as stock (19mm)
-place the pads in bla bla bla
-Bleed the brakes, replace the wheels, and go for a drive

You will be surprised. The calipers clear the wheel by one millimeter.
Ill have pictures up later if anybody wants them.
thanks