I just read this on another thread:

This got me to thinking. The reason it got me to thinking was because of Nissan's use of Electronic Brake Force Distribution (EBFD) on the Z. Basically the Z has no fixed brake bias unlike most cars. In most cars say the front would lock up first, so the ABS kicks in. The car with a fixed bias would not send any more braking force to the rear, even though they might only be working at 50% while the front is maxed. EBFD allows all the brakes to work at their maximum, regardless of load placement (weight distribution).

So when you look at the Stoptech test where going with bigger brakes in the front caused the rears to overheat, what that really tells me is that the fronts were locking up early and not apply the correct relative torque compared to the rears. Now ABS/EBFD should theoretically take care of this and allow all the brakes to work at their maximum efficiency, but from the looks of things, that simply was not happening. The only explanation that I can think of is that there was something actually wrong with the front brakes causing them to activate ABS very prematurely and thereby sending way too much brake force rearward. Maybe they needed to use a less aggressive pad in this case, but something just doesn't add up.

When I look at the above kit offering and I see and adjustable bias, that wouldn't really be true in the case of the Z. Now I am no engineer so if anyone truly knows any better, please correct me.