I wish I had some pictures of some of the "me too" headers that came out (and soon disappeared) for these bikes in the 1970s. There were 2 sets (4-1 and 4-2) and a set of TT pipes with a cross-bracket on their ends that was held by the rear lower engine mount, from one vendor who's name I've forgotten (as has everyone else, they vanished quickly) that were cheap and shiny, but made it 100% impossible to remove the oil filter without first removing the pipes. And, the 4-1 and TT sets actually touched the oil plug bolt on the bottom of the 750's engine, so you couldn't even drain the engine, either, until the pipes were gone.