I have changed my 02 senser above the cats on.

I have changed my 02 senser above the cats on both sides
But I am blowing a lot of smoke and gas is leaking out the pipe
I dulled me exhaust out to the rear bumper cleaned out the cats. I strait piped the exhaust no mufflers or anything. It runs really ruff like it is flooding out because it's not firing right. I have no codes popping up on my hand held scanner what should I try next