I got my 07 B7 with 112000 mls done in July 2016 at VES Sport in Braco...Scotland. He put it on the dyno before and after. Before the clean it was getting 276bhp at the wheels and after the carbon clean and a wee remap it was getting 335bhp at the wheels. He also told me the remap would give me 22bhp, so you can do the maths..you get a fair bit with just the carbon clean. I do have pics and they look very similar to the ones above in gray99y's comment.