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To answer the OP, you want the pipes as physically straight as is possible. Sun Tzu would say as is easily possible, but I doub thats necessary. If its too difficult you won't do it.
I have considered it for 2 reasons, 1 if you turn the engine around your AIT is not pre-heated by the engine and 2 the exhaust doesn't have to do a 180 turn to go backwards.
I'm looking at going lean burn and so the lowest possible AIT is desireable to keep it away from engine damage. On that note the only way I know to make my exhaust not do the 180 turn is to mount the engine backwards with an additional gear to change the direction of movement, but I doubt thats conducive to FE.
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