I used the kit 2mm chassis and started with my base stock setup. During the race, I missed some reactivity in the tight chicane, so I switched to the stiffer #372188 black front spring, the stiffer #373585 gold side spring, and a narrower front arm. To maintain rear-end stability and corner speed, I lowered the pivot all the way to the chassis and added a 5mm upstop shim.