Nice to see a Sierra on the other side of the ocean! I think the Cosworth body kit (skirts, bumpers and grill) improve the look, but imo the Cosworth rear wing doesn't suit the extra window of the XR4(t)i body shell. It makes the rear a bit too 'busy' for me, so I prefer the bi-plane wing of the XR4i in that case. Nice to see all the upgrades you are doing. It must be a lot more difficult getting all the improved parts over there. Rear disc brakes would have been an easy upgrade if you were in Europe.