Started with just the fronts and then upgraded the rear to 4-piston with e-brake hat. They are great and stop the car very well. No bias problems with stock rear calipers. They work a little faster than the ABS system, just something to note but not a problem. Never had them fade even on the track. Upgrade your steering rack bushings for better feedback. Bleeding is a bit more complicated as you need to bleed both sides of the caliper. After having a complete setup on a car w/450whp driving in the mountains, stock is very weak.