Ok I just bought a zzp header and catless downpipe. There is not a bung for the 2nd o2 sensor. My problem is I am only getting 13 mpg. I was wondering if anyone would know, if I were to add a bung and a new sensor, can I get my mpg back? And if so how? If the 2 o2 sensors are reading the same numbers, how will that change my crazy fuel delivery?

 

u need to get tuned for being catless

 

There's no bung at all on the downpipe?

It's literally a pipe. Haha!

 

no there is not u will have to install a bung... i had to install one for my afr gauge