The first upgrade was a set of stainless braided brake lines. S-4 brake calipers we upgraded to with the help of Technical Dimensions caliper adapters. We intended to machine these adapters ourselves, but time constraints preparing for a driving event forced us to buy instead. This added 24% (as per our calculation) more brake pad surface area. The new larger required rotors are 12-1/4" diameter from the 12" stock rotors adding a little additional leverage as well. We are using a carbon kevlar brake pad that we had good luck with the previous year. We gas slotted the brake rotors front and rear. 5 shallow groves were ground on both sides of the rotor. A very simple process, that anyone can perform by hand, with a straight edge and a high speed die grinder with a 1/16inch cutoff disc. A cockpit mounted, adjustable brake proportioning valve was fitted under the dash.