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Don't the new V6 use manifold in head design? That might be part of the reason. It's just a consequence of how that area of the exhaust has to bolt-up, clearances, etc. and they may have been trying to keep the engine/trans mated to the exhaust in that fashion to help with any vibrations or metal/metal contact if there's slack in the exhaust. There are other cars where metal/metal contact in that area can cause some sensors to register false-knock.
but, I'm just grasping here because I don't have a V6 and nor have I looked under one.
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