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New here! Got a 2005 civic ex 4dr. I wanting to get headers and possible gut my cat. In yalls opinions does gutting the cat cause any real issues. I'll buy a spacer for the downstream o2 se sensor for no check engine light. Any tips or insight?

 
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I wouldn’t. I went full catless briefly on my FR-S and it *stinks*. I switched my tune and was able to net decent gains but wasn’t at all worth it for the daily driving I did. I am running a catless header but the secondary one is still there.

Beyond the smell, your car’s just going to sound awful. A header is fine but leave the secondary cat alone.

 
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there's only one CAT in 7th gen cars.
https://www.civicforums.com/forums/2...p-version.html
ah, if you sell the cat, you get money, instead of gutting it...

 
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You can tell I never did the exhaust on mine lol

Either way, I'm standing on principle. Too smelly and won't sound very good

 
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Dont gut the cat