catalytic converter

[jfritts]

i got a 1990 EB with a 351w. i recently pushed me some full length heddman headers and am about to redo my exhaust. It has two stock catalytic converters and i was wondering if i remove them and replace them with one performance cat will it affect my engine and mpg?

 

[ford_302]

i got rid of one and i noticed about 2mpg increase, dont know that i felt more power or anything, but it shouldnt hurt anything to get rid of both

 

[Yardape]

The cat burns the unburnt fuel, if you remove it you have unburnt fuel polluting the air. Most dont care about that but you will get noticeable smoke and a bad exhaust smell.