The kit price includes a great street pad from the same Italian company that supplies our street pads for stock brakes. Plus, they include anti-squeal pads. I'm really happy with them.
We also have EBC Greenstuff pads as a higher-temp option, if you need it.
About the pedal feel and brake bias: we put some thought into that.
The calipers that we went with were actually carefully selected for their piston diameter and effective braking force by fluid volume. This caliper has a lot to like, such as the smart removable-piston design, and ease of pad installation, but that was the deciding factor.
In other words, the Prima brakes should work very nicely with your existing rear brakes, because that's what they're designed to do. They maintain stock pedal travel and nearly stock brake bias. Or, if you're unsatisfied with your rear brakes, we'll probably be coming out with a Prima rear brake setup before too long (which will offer 50/50 bias).
On the issue of weight differences, I'm not certain that many could tell the difference in handling or acceleration between the stock brakes and Primas. The Prima caliper and carrier comes in at 6 lbs, vs a stock caliper and carrier at about 5.5lbs+hardware. Of course, a vented rotor is going to be somewhat heavier than solid, but I have a hard time believing that the empirical benefits don't significantly outweigh the small amount of added rotating mass. In addition to that, Fiat used vented rotors and this type of caliper in front of all of their similarly sized sport models following the sunset of the X, with excellent results.
Happy to answer any other questions, and I'm looking forward to your writeup, Pete.
