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anyone want to walk me through the plugs like the location of the DEF module and the 2 NOx plugs

so the issue was probably i didnt have my can bus plug kit installed. i feel stupid for even asking this but where is the location of the plugs the kit has to be plugged into

Yes it’s now straight piped and it’s supposed to be a tune to support that

I got the HP tuner with the unlocking device on my 2020 2500 chevy. hooked everything up and started downloading the 2 tune files i was sent. for some reason now the truck is telling me to change air...