Direct to fit Catalytic Converters come ready to install with all parts pre-welded. These are better for the DIY professional. Universal converters are cheaper, but require cutting, welding, etc....
A catalytic converter- (cat-con) takes raw engine exhaust (CO, unburnt fuel, nitrogen oxide) which are very harmful to the air we breathe. (nitro oxide causes acid rain) It catalyzes (splits) the...
if your car has duel exhaust, they should be located a foot or two away from the headers, since the exhaust heat makes them work. They have to be cut off by a mechanic, and new ones welded back on as...