I have 2001 Audi A6 4.2L. I have Ross Tech and the Bentleys for my 1998 A8. My Bentleys is for the D2 covers 2001 but dose not have info on this manifold. I bought this A6 as a basket case and just started sorting through everything. I am doing TB and pulling cams to replace the cam chain tensioner pads, all seals etc. I have never had this car running and have timing parts on order. Down to the problem the "arm" for the 3rd stage change over valve was broken. The 3rd stage change over valve shaft was frozen. I thought I was carful but broke that weak and weatherd plastic end off the shaft. Any help on buying parts and repair? link to diagram? Not the first nor the last with this mess.