Do it! I swapped my original cats (all original exhaust) to decat pipes from ebay (89pounds+pp), they have some damping, and I could swear it pulls better in 3-4,5k rpm range, maybe some loss under 2k rpm, but not sure...
The sound is a little louder, a bit more raspy, but otherwise still good for everyday use. But when you step on it...oooooohhh, best spent 89pounds in years!
But my engine check light did come on after 2days, reset it yesterday, so far it is off (code P0420 and P0430 - Catalyst System Efficiency Below Threshold ). But I have bought PC dongle for 30€ couple of months ago and it takes 1 minute to reset the light.
Anyone knows, how long does it take for ECU to set itself back to normal? I think a couple of minutes, but could be wrong....
About MOT...I know a guy... and i have to do it every 2 years... oh, I have a 04 sunset....
Best PM Alex and the light will hopefully disappear forever!