Unless you increase the size, I doubt you are going to see any significant change (other than sound) with the axle back OR the cat back. Going to a larger downpipe will make a difference and of course then you would need to change the cat and add a full 2-1/2" from the cat back. Single vs. dual will not hurt the performance.
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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