Here's a snippet from the info I have on Audi 6a lumps, you'll like the bit I've highlited in red
F it t i n g K R c a m s a n d c h o o s i n g a n i n l e t m a n i f o l d .One thing that makes the whole job worthwhile is to put the cams from a KR into the 6A. Those fitted to the 6A only allow it to produce 136bhp (which is less than the KRÂ’s 139bhp) although the torque is much better.
Fitting the cams from a KR to the 6A can see the engine get 170bhp with upwards of 150ft/lb torque if properly set up. These are a straight swap, but remember that the cam bearing caps are matched to the head and not to the cams. The cams wonÂ’t turn if you get this wrong!
