Hello, 
I swapped the old M40 from my RHD E30 out for a M42 from a LHD E30. Engine swap was more or less straightforward except for the exhaust manifold. We had to cut off much of the exhaust to stop it from hitting the steering. Has anybody found a practical solution for this? Would it be possible to get an exhaust manifold from a top mount turbo and flip it upside down to face downwards around the steering shaft? RHD M44 headers are much more plentiful than RHD M42 E30 headers; would these work?
Let me know if anybody has come up with an easier more affordable solution than custom headers. 
Thanks!