Do I need to drain and refill coolant to install this?

You'll need to drain the system if you're transferring coolant from your old tank. If you're starting fresh, fill to the cold-fill line after installation. Either way, bleed air from the system by running the engine with the cap off until coolant circulates fully.

Does this come with hoses and clamps?

The tank assembly ships with the cap. Hose connections use factory clamps already on your vehicle — reuse them when you disconnect the old tank and connect the new one.

Will this bolt straight to my engine bay without modification?

Yes. Mounting points match factory specifications — your original bolts and brackets work without drilling, welding, or bracket fabrication.