[idriveattz32]

i've looked into this before as well. I would start with ducting and if that was not sufficient I would look into making this work:

Since you already have the 300ZX rear setup, upgrade to racingbrake.com 2pc rear 350Z track rotors, the larger size should help cooling. Then I would look into sourcing some porsche boxster-S rear calipers.

You'll have to make custom brackets to make this work and may need some hard metal shims to get the spacing of the brake pads right because the 350Z track rotor is 322x22 while the porsche is 299x24mm.

If you wish, you could stick with the 300ZX rear rotor which is 296x18mm (racingbrake.com sells a 2pc) and go with a cheaper easier to find non-S Boxster rear caliper which mates up to a 292x20mm, but again you will still need brackets and shims to place the pads rights. This should save you on some cost though.

I've looked into this before but never went anywhere with it and have no clue if this will even work, so good luck!