Originally Posted by
bschmitt
Im not gonna tell you to put your cats back on, but my friend cut his off two days ago he wants to know if it hurts performance of MPG
Removal will not hurt performance.
if left on and they start to plug up, that will hurt performance.
Most after years of use start to get plugged up.
If they do start to clog, just cut them out and replace with pipe.
And no, will not hurt mileage either.