Do I need new hoses and clamps when I install this?

Your existing hoses will reconnect to the factory ports on this radiator. Inspect them for splits or hardening before installation; if they're original and cracked, replace them while you have the radiator out.

Is coolant flushed out or do I need to do that myself?

This radiator ships dry. Drain your old coolant first, install the radiator, then refill with fresh coolant and bleed the system according to your vehicle's service manual.

Will this fit if I've modified my cooling system?

This radiator is built for factory cooling loops and mounting points. If you've added auxiliary coolers, custom fans, or non-OEM piping, test-fit first to confirm clearance.