Aluminum front shock tower, for durability. Tuning parts like shock pistons, shock springs, webbed shock bladders, Option 1 and 2 akerman bars, 12 deg. caster blocks, and sway bars. Aluminum servo arm to replace the stock plastic one. Hard servo saver spring.

I haven't even used the low rear roll center toe in plate yet. Anything else you'd want would be bling or weight reduction, like hard anodized shock caps, Ti tie rods, LW hubs/wheel nuts, Ti upper shock mounts, etc.