ya they are bad ass, i have them on my car and they work awesome. you can use 97 or 98 Q45 brakes, i am not sure if you can use beyond those years, but it is a large 2 piston caliper with a 11.6 inch rotor. a 300zx rotor is 10.1 inch. i paid $50 for used calipers, $140 for new rotors, and $40 for new pads. A nice brake upgrade for $230.