One small problem we encountered during the set-up process was the injector wiring. The Painless harness we ordered was built for year-specific injectors. When we upgraded to the newer 36-pound FAST injectors, the harness was not equipped with the right clips. We were dead in the water, but Mena called a Chevy dealership, and $140 later we had a set of updated clips for the new injectors. Wow, those are some expensive clips.