I remember being in my cousins boyfriends 20v coupé, and that thing flew!!

Indicated 148mph, very fast cars!! I dare say his was modded aswell, but still, bit of a weapon!

At a guess, id say stage 3 cos would be good for an indicated 170mph? ish, but, as said, the speedo will over-read a bit, so probably 5% slower in reality.. ish?