I'm looking at getting a tuning box for my 530d msport 2011. I know remapping is better as I had my old E60 remapped and loved the results but that only had 6 months warranty left. As this one has almost 2 years left on the car, remapping is just not an option. I spoke to the guy who did my last remap and he said on the new models there is no way of hiding the foot print and bmw will find it and delete it. So this leaves me with the option of a tuning box or leaving it stock. I just wondered if anyone has had a tuning box on his particular model and what were the results. If not who is reputable company who can provide a tuning box, I'm not intrested in any simple resistor box which floods the engine with fuel. Ac Snitzer do one but £3k is a stupid price?