This is a performance orientatd thread for all interested in what can and has been done to the W126. This is not just an index of links to previous discussions, but all are welcome to ask and talk about all things perfromance regarding the W126.
I can't speak for the other mods, but I think they would agree with 'why not'.Can one of the mods make a "W126 Performance" sticky? I would be willing to troll back through the posts to gather all the links to fill it in.
Only the front half of the log headers are the same. On North America spec log headers the right hand = passenger side header goes into a pipe that bends around the back of the engine and joins at the rear of left header = US drivers side to go into one single downpipe.
Its probably the reason the R = passenger side cylinder bank / cam & valve train frequently goes bad first.
Its limited breathing.