I have a 2013 V6 with BBK LongTube Headers and off-road X-pipe and Borla Atak cat-back. After a long time, and numerous trips to the shop I figured out my engine light was a bad O2 sensor. I bought two front NTK sensors from American Muscle and they have great reviews. My performance shop said NO use Ford ones, Well they are A LOT more. Anybody have experience with Ford verses NTK?? Also If I just stick with Ford like I have, I have been told to replace both, and that it doesn't matter. I am very confused and need some advice! What do you guys think?