So I am installing Pacesetter Long Tube Headers with their y-pipe. There is only one O2 sensor bung on each side. Which O2 sensor should I use, pre or post CAT? Or should I combine the wires from the harness into one sensor, since I have to extend them anyway? Thanks for the help.

 

this is a very bad idea dont combine sensors believe it or not your car needs them to run right and dont splice wires in there to extend them get actual extensions

so theres no bung on the y pipe??? if not your going to have to get one welded on (or get it tuned out of your computer)

 

if its not a catted y pipe the bung holes are not installed. you would use the pre cat 02 sensors in the headers. and by the way, new headers will fould the 02 sensors so it would be good if you can use the old sensors untill the headers have been to long term operating temp a couple times.

 

Alright, thanks