Friends you are right , please DO NOT remove the cat if you are not facing any problems with your car !
Actually the mechanic was convinced that it was choked since the pick of the car had deteriorated. frankly speaking after the full tuning and removing the CAT the cars performance improved alot.
I checked the capillaries in the filter when it was removed. (about 30 % were blocked).
But beleive me our petrol is not upto the mark in Pakistan and it ends up choking the converter and consequently your engine cannot exhale properly!
Anyways, please do not remove it if not required. The results may not be as good as you expect if your car is giving no trouble!
plus their will be an addition of a hollow sound from the exhaust when you press the accelerator once you remove the catalytic converter.