Header with dofouler still got cai
 

I just installed sp long tubes and 02 defouler. Drove it for 80 miles no problem. The next day threw a cel. I guess the defoulers did not work. Can i use car with a cell until I tune? Do i need to take the defoulers out when I tune?

Yes, you can use the car until you tune. The rear O2 sensors are turned off with a tune so you don't have to do anything.

Thanks