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1. you can't use 300zx rotors without the calipers
2. yes
3. disadvantages = prone to cracking, less material to absorb, and dissapate heat.
advantages = mucho bling, allow outgassing if your using crappy brake pads.
If your driving on the street, you will probably NEVER get your brakes hot enough to need it, and if your racing on the track you should be using better pads that don't outgas, and rotors that aren't prone to cracking, and causing a critical failure. (read: get blanks)
If you are going to do a full overhaul of the brakes though I would recommend getting 300zx froont brakes. you can get reman. 300zx calipers cheap at advanced auto, or auto zone. Buy some High Temp engine paint to dress them up. Buy some nice pads.. Axxis Metal Masters are nice, and aren't outrageously priced. They are an excellent street pad. Then get some of the 300zx conversion brake lines from Don at PDM-racing.com. you could buy a couple of the "redrilled to 4-lug" brembo blanks from heavythrottle.com. And don't forget getting some good brake fluid. I recommend ATE Super Blue, or Ford Heavy Duty(much cheaper). speed bleeders are nice too. you can get them through don at PDM as well.
Get all that, and your brakes are done.
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