Hi all - 2016 X5 M standard with the 20" wheels - Drives great but I've noticed that under hard acceleration in sport mode and using the paddles, the gear change from 5 upwards clunks - is this normal ?? its not a real bang but like a dull thud each time you change and you can feel it through the ...

Have you cleaned all the protective paint from the tow ball ?? all of it must removed - Its the same with any tow ball that is being used with a hitch head stabiliser like the alko and its the paint etc that creates the noise.