im about to replace my stock radiator with a koyo. should i replace the upper and lower hoses when i do this?

 

Unless they're less then a month old...Well you are at it, replace the lower passenger heater hose as well. It's a pain to get to with the shroud in place. And be sure to use high-quality hose clamps. The generic clamps sold at auto parts stores suck.

 

where is a good place to get high quality hose clamps?

 

Any local speed shop can get them for you. Other then that, Summit Racing generally carries them.