well, here are my thoughts..
car in question 1.8 t
We just removed the back box (rear silencer) and had a straight pipe. Now not the most beautiful solution, but the sound was good, not too intrusive, and best of all no drone.. Seemed like the Turbo "absorbed" all the sound.. So it is a cheap fix, and reduced weight, and I am sure that the car will pass the MOT, since it does not sound excessively loud..