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 t...

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.