no some cars will evenn fail with sports cats fitted what i used to do with ma civic was leave the pipe on duing day to day running and refit the cat for mot's
but the cat was seperate and only had 5 bolts holding it in place wot you might be beter doing if getting alower part of the mainifold and cat ppe custon made then swaping it after the mot
might not be worth the touble tho you might only see 3-5 bhp increae
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