What happens if you take the catalytic converter off of a 1998 Chevrolet Silverado?
It would be plain stupid to remove the converter. The converter
is designed into the engine controls of the vehicle. Removing it
wouldn't really increase power because they have very little
backpressure. If you want to remove it because its plugged or bad
then you could do so but the check engine light would come on and
it would never pass a smog test. It won't physically hurt the
engine to remove it. Removing the converter is against the law. I
would have an aftermarket converter welded in to replace your old
one if its bad.