My original psi pipe on my 1st Phazer in the "80"s was rear dump so I had to cut a new hole. When I got my second Phazer in "90", psi had pipes available that exited the stock exhaust hole so I bought a new one rather than cut a hole in my brand new sled. Just progress over a few years. I would imagine that it was the the same way over at aaen.
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Looks alot like on i had on my old exiter