Brakes!!! I have Wilwood 4 wheel discs. They were terrible to the point of being frightening until I had gone through 4-5 complete break in cycles as described by Wilwood's instructions. Since that break in, they are probably about as good as any car I've ever owned. I'm not a fan of that so called metering valve(hold off valve), preferring a straight proportioning valve on the rear brakes plus the two residual valves(assuming the MC is below the floorboards).