Check Engine Light Question
 

Recently.updated my 2016 Z51 with Kooks long tubes and off road catless X pipe. I now have a constantly illuminated "Check Engine" Light as well as an "emissions sysrem" error on my monthly GM email report. Is there anything I can do to eliminate one (or both) of thess?

get a tune

if you are not tuned you will have this and probably run very rich on your fuel mix.

How's the sound? Much different?

You can install Kooks green cats and get by without a tune unless you also have an aftermarket air filter and/or intake system.

https://www.kooksheaders.com/green

It's your rear 02 sensors, you need a tune ...
Dave