I am putting new ARH Headers on my 2008 Chevy Silverado 5.3 with flowmaster cat back. I will be running the ARH Headers, Y pipe, and ARH high flow cats. I was not sure if the O2 sensor would be messed up from the high flow cat or not?

Thanks!

 

The rear o2's will most likely throw a code, but it doesnt hurt performance or anything, just a PIA with that light staring you in the face.

 

I threw a code, I believe it was low efficency. Had to modify tune for it.

 

I am dyno tuning the truck this weekend for my superchanger and smaller pulley. If the code is on I am guessing they can tune it so the light stays off?

 

they sure can.

 

You will get the cat codes and as others have said they can be fixed during tuning

 

just turn off the rear o2 sensors and leave the front ones on, thats how mine is