will it pass its MOT with the silencer removed?.... or am i been a tad stupid here....
That would be a judgement call on the tester, i.e. if they thought it was too loud then they could flag it - but would need to be pretty excessive.
Why would that be?
When I had my Ragazzon cat-back system fitted by my dealer they said that the warranty wouldn't be affected. Removing the cat, however, MIGHT affect the warranty, they weren't sure about that at the time.
The way I would see it in your warranty is that if by removing it, there was a knock on effect (excess wear on the turbo etc) then a dealer may just draw the line at the modified exhaust and say "There's your problem".
Final Edit: Removed some opinion from this. Service book outlines what can and can't be done to the car for your warranty to be maintained. I won't be commenting on issues like this again as it will just end up opening a can of worms.