Its a muffler.. Seriously how hard would it be for ford to fix it. Im with ib its a bit of a joke. As far as the diff bush goes. Ive done one on STOCK power. IB a way that you might be able to adjust it is to unbolt the exhaust from the dump pipe and move it around. DA on site would be more than happy to do this im sure. Prior to doing the clutch in my car the exhaust tip was on a slight angle and I was able to fix it via the dump. So senna. Regardless of mods and if YOU still had the stock exhaust and the tip was on an angle would you expect ford to fix it. I know I would