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You will have to put a normal exhaust back on for the MOT. If you have the old one, then you definitely should swap that back over. If you don't, you'll have to buy a new one. Any normal MOT garage won't pass you with a decat. When your data gets printed it shows how many Particles Per Micron of bad gases you are outputting. No way to reduce that below the limit without a CAT. These are the hoops we jump through to have modded cars.
 
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