It is a bit harsher than a standard diff but nothing u carnt live with mate! But the level of grip it gives u is like night and day over the standard one i have 500bhp and around the same torque and i get good grip with it with r888s. It cost me 700 for the diff unit a mates dad did the shot peening on the cwp it was about 70 pounds for all the bearings and seals from oakley bearings and a new pinion nut and crush washer was about a tener from ford then i did the work but i did have to mod the caseing as its quite a big diff unit