So I've been wondering this for a while. Who has taken all the cats out of their N/A? I removed the rear ones and I've been debating taking out the front ones but I'm not sure about it.

I have two questions:

1.) Gains?
2.) How do you bypass the O2 sensor behind the cat so it doesn't throw a code.

I'm not worried about the legality of it, I live on an island where if you take your eyes off your car they'll rip off the cats and sell them.