So I got my cat and it had 2 holes it in for the oxygen sesnors. My passenger side long tube also has a o2 hole in it.

I was thinking fill in the long tube o2 and use the ones on the cat?

Any input?

 

i would use the one closes to the motor for the best air/fuel ratio ... i thought you would have got a cat with no holes just put it in the y-pipe ??

 

Use the one in the cat so you get both sides of the motor (assuming you are using a y-pipe). You can buy a plug for the hole in the header. The amount of oxygen in the exhaust will not change unless there is a hole in the pipe so it is fine to put the O2 sensor farther down the pipe.

 

The cat came with one plug and yes I'm doing a Y pipe.

Nick the cat that I showed you came with 2 holes in it and one plug. I sent you the link on facebook.

 

oh thats cool , if it came with a plug and a 02 thats sweet i may go with it also