Chris K said:Well the 172 mk1 cat is designed to bolt on the same as the de-cat would.
Therefore if you had a downpipe made and then a de-cat pipe that's easily bolted on and off you would have to get a cat that was the same size when it comes to MOT time... if that makes sense.
Here's a crap pic i've drawn in paint which kinda shows it lol.
Chris K said: