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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.
 

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gutting the cat will create a plenum. It is better to put a test pipe in than have that chamber :)
 

· DAMN u a big one lady
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probably won't notice much... maybe exhaust might be a little throatier? Maybe it would be better to get a high flow cat instead of a test pipe for some back pressure, and it'll be healier for the environment
 
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