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I've had enough mufflers put on to know that a 2.5" in/out aluminized muffler can fit any exhaust ever made. You can always make the inlet bigger, and you can always just insert the smaller tube in and weld it on that way. It's only when you use clamps that you really have to worry about same size pipe and muffler inlets.

Borlas are nice but they are expensive, i would suggest either a dynomax ultra flow series, or a magnaflow 4x11 or 4x14. about half the price and just as good.
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