I had a question unfortunately when I got a chance to look at the downpipe it was to late to call and I want to install the part if possibly. Should the catless downpipe have a provision for the stock O2 sensor or is it just disconnected and tuned out?

 

u need hpt or a o2 eliminator. but their is no provision for secondary o2(smog).

 

I just thought it was kind of weird.