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The cat next to the manifold is the one that heats up first and is there to reduce the emissions from start up. The one under the car should be enough to get the car through the mot providing it is nice and hot. This works best if you can give the car a good run immediately before the test. If you leave the car at a garage all day, and they fire it up at 4pm and put it staight on the rig, it will struggle to meet the emissions limits.