Hi well if you look up "Mounting racechip in Mini Cooper D" and you will see a guy fitting one. Different make but same place. My engine is the same as your one so same fitment. The rail sensor as you look down at the engine is on the right hand side of engine down the bottom. You can just see the end of the plug. There is a company that makes an extension for £20 which makes it easier to swap back. The plug is a pig to get off. Guy in video makes it look easy. I could not release it so my son became the guinea pig fitter. You have to use your left hand, lift clip on top of plug with the edge of your finger and pull, thats the only hard bit. Very carefully connect other part of plug as I bent pins at first but ok after straightening. The first plug did not work and I nearly gave up but they said 5% of Mini plugs are different but they sent a different one free of charge of course and going well. Today mpg seems to have improved by 3 mpg and started well and still put a smile on my face. The feedback on fleebay for them is very good with 6k sales plus. I would not want anymore power so dont see the point of paying more. I have researched and know some boxes are crude resistors but if it improves power, mpg and does not pour out black smoke out the back then happy days. The leaflet says that the engine light may come on on max but once I tweaked it back all is well and the light goes out straight away once you turn off completely and restart, 3 quarters seems to be just right. If you need more info let me know. You will read many opinions so I just wanted to try myself. I presume a remap may bring turbo in earlier, my power comes in at the same time but lots more of it. The interesting thing is my lad has the same car an 07 as well but before tune his power comes in lower but he got in his after driving mine and said his feels like a dead duck now. If you are in London you are welcome to try it, I cant believe the difference.