According to the Porsche PET, the manifolds are the same for manual or tip - the only different manifolds are for 3.6 cars with the X51 power upgrade. There are also different part numbers for the 3.6 manifolds vs the 3.4.
Was there ever clarity re the manifolds being different between tiptronics and manuals? I ask because i'm looking for a well priced stainless sports manifold for my 3.4 tiptronic.