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Its to solve a problem. My cat / exhaust hangs low as the exhaust is too short. With the decat its tight, no leaks. But I'll need to fit the lambda as it goes nuts without it. Just need a new one.
It drops to about 9mpg/5mpg on idle, and when I drive it drinks. Just drinks. It was leaking pretty badly though, so I think maybe the precat was getting quite a lot of air to it and upped the fuel rate to compensate. Put the cat back on and it went up to 35 again.