i did a genuine 12.1 at crail in a 4x4 saph with full road trim, was a proper hard launch with no mechanical sympathy, i know loads of people wont beleive this but i still got the time sheet somewhere to prove, that was with greys and peaking at 30psi(not ideal i know but it shifted), the crail timing gear isn't the best but its nowhere near as good/smooth track as the pod