A catalytic converter also known as, "cat" or "catcon" is a device used to reduce
the toxicity of
emissions from an internal combustion engine.
Why Remove ?
Removing it can improve your car's fuel consumption average. Though removing it can get you trouble in developed countries like USA, Japan, UK etc.. But people living in Pakistan, India, Malaysia and other under developed countries doesn't need to be worry.
Dis-advantages of Removing it?
To keep it short, i will only say that it increases pollution in the air.
Process of Removal :
(You can click on pictures to enlarge them)
Note : Please be assure it is a professional mechanic job