my g35 coupe has the original none brembo brakes can a 300zx brakes fit does any one know..

 

Not a bolt on, requires custom fab brackets due to different size (smaller) rotors. If you have an '06 or newer coupe then the stock brakes are better anyways, if '03-'05 it's basically a wash, stock is a larger diameter rotor, 300ZX is a better caliper.

If you want a reasonably priced upgrade either look for a used Akebono kit or a G35 stock Brembo kit.

 

After driving on both, the stock Brembo kit is a better option than the 300zz and I would argue that the 300zx is simply a more complicated caliper.

 

A good pad is all you need. My akebono street performance pads make the tires screech and have great linear feel.