I had a de-cat chip fitted to my Tuscan from Dom at Power, I was advised at the time that my car would pass an MOT without re-fitting the cats, well its MOT time, shall I risk not putting the cats back on for the MOT?
I also have a Power chip. Had the car MOTed a few weeks ago and it passed, but only just. Make sure its good and hot, the throttles are perfectly balanced, and the temperature sensors are working.