About the optical illusion or not.
You have the answer in those comparison images with all the lines.
Same running board. The exhaust pipe ends the same distance
behind the running boards
BUT
there is a significant difference in the opening between
the end of the exhaust pipe and the rear wheel.
Since the wheel and the exhaust pipe end are both in almost the same vertical plane (place a vertical board against the side of the vehicle) there is no optical distortion changing the relation between those two items. Objects closer than or further behind that optical plane will move in relation to each other and the wheel-exhaust pair.
Tank_1812 has already provided the correct answer in his post above mine (15 inch frame stretch)
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