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I've got an 89 na supra and i was thinking about gutting the cat and running a 2.5inch pipe through it. What are the pros and cons in doing this? My cat-back is welded to the cat, so i was gonna unbolt the cat from the manifold and saw the pipe off the cat-back end. Then gut it and weld a 2.5 inch pipe through it, then rebolt to manifold and use Exhaust clamps to connect the cat-back to the cat.