Will this work as a direct bolt-in replacement for my current radiator?

Yes — it uses factory mounting points and existing hose connections. No drilling, brackets, or adapter fittings needed. Pull the old one, bolt this in.

Do I need to flush the cooling system before installation?

Flush the system before you install the new radiator. Debris left behind can clog the fins and defeat the whole purpose. It takes 30 minutes and saves you a failure down the road.

Which engine does this fit — I have the 5.7L, not the 3.6L?

This radiator is engineered for multi-engine compatibility across this generation platform, including the 3.6L, 5.7L, and 6.1L. As long as your vehicle is 08-16 in this lineup, you're covered.