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You'll fail an MOT if your cat is missing on all post 1991 cars. If you fit a cat-replacement pipe, you'll have to refit the cat to get the car though an MOT.
"Cat back" systems are basically the backbox, and piping from the backbox to the cat. The piping bolts onto the cat rather than replacing it.
Hope that helps
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Owner of Primeraweb, and a 1997 Nissan Primera SRi driver
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