And you first need to consider the heat insulators. In all cars with a single exhaust the tail pipe is on the opposite side to the fuel filler. You absolutely need to keep them apart. When a tail pipe is put on the same side as the fuel filler there is great emphasis on designing something that protects the fuel. If you are travelling down a motorway the exhaust is going to be in the region of 600c and a sudden stop followed by a rear end shunt will collapse the components and you will want as much separation as possible.
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