Yeah, any BOV can fit on any car, but in most cases they will have to be welded onto the piping. I'm sure there are a handful of kits that were made for the 300zx that will easily fit on. I forgot that the 300ZX was a V6, and I think it does have two throttle bodies.Hopefull you can figure this one out on your own. I personally hate the HKS SSQV because it was designed for the sound, and I hate the sound of it.

This reminds me of a kid that recently bought a '91 300ZX TT. When he got it he told everyone it had a chip, an intake, and a full exhhaust, and was making 400hp at the wheels. I took a look at the car yesterday. Stock intake, stock exhaust, and I'm sure there's no 'chip' in there, either. All the car had was a shiny exhaust TIP on each tailpipe. That kid got punked and he didn't wanna believe it. Totally stock.