Brakes
 

Might be a dumb question, but what is needed to do the brake swap off the
Q45?? I have read what is required for the 300z and was looking at going in that direction, but i am interested in the other swap now. Im not trying to make my car the baddest in town. Just trying to make it better all around. I don t like the brakes. Not enough umph. I have new pads, rotors, fluid and lines. Still not enough for my tastes.

You just need the calipers and rotors, brake lines are the same fitting as the 240sx, if you havent converted to 5 lug, then you need to re-drill the rotors to fit 4 lug. You will also have to either bend/cut/remove the dust shield.

Brakes
 

Ok, but what year Q45??:-/

1990-96 Q45 also I heard you can use M30 rotors since they are suppose to be the same size as the Q45 & j30 rotors, but in a four lug pattern. You can still keep your bmc I would also look into the Z31 rear conversion, but if not then your factory ones should be just fine with a pad upgrade.