just thinking in my head if you buy a cheap 2 to 1 header and cut the single collector off to make 2 collectors and run the pipes out to the rear wheels.... thus having cyl 1 and 3 on there own collector and cyl 4 and 2 on the other now im stumped on the o2 sensor will i have to run 2 pig tailed together or just keep the single o2 sensor?

 

guess this was a dumb question