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Ah, thanks I had forgotten to consider the valves themselves. I knew something was awry when I mentioned valves but I couldn't quite grasp it.
Ok so in that case there would be a very slight bend so that the exhaust pipe could miss the cams or whatever you have that drives the valves.
Doesn't have to miss it by much just enough room to put a thin layer of something to shield them. So instead of what looks like 45 degrees of overall bend in the above diagram to maybe 20 degrees to miss the cams. Compared to the final exhaust system(in my car) it shifts 90 degrees straight out 90 down 90 towards the rear of the car(in sloped curves) opposed to the proposed 20-30 degrees total?
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