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No idea how u can offically pass with a de-cat even with a standard exhaust, sounds like bs. You need to find a friendly MOT tester willing to accept some cash in hand to put another car on I havnt got to worry until Dec thankfully!
I do know that silencers dont affect the readings, i had a punto tested with a standard system on then tested with a 2 1/2" straight through cat back on and no change. just worried about the decat.