Im pretty sure a 4th gen y-pipe will not fit your 3rd gen. The cat-backs may be similar, but the deisgn and position of a 4th gen header/collector/catalytic converter will place the y-pipe either further back into the frame & just bang the floor boards in the wrong place. Just go to mufflex or exhaust shop and get a y-pipe fabricated, or buy one from Hooker.
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