^ I am lost at this thread, Glad I've bought a Chevy.. haha
From what I under stand. The SLT and Denali model might not need the Canbus since their DRL is using LED instead of the low beam.
The SLE and lower model might need the Canbus to run full power because there DRL using low beam as the power source.
The Canbus is just preventing the buzzing noise and flickering issues.
Correct me if I'm wrong.
I'll get the Canbus if I was you, just for a piece of mind. If it doesn't need it,you can always resale them to the member on here.. ;)