Originally Posted by wrx oh oh

Saving money by using a cheap or used radiator-

The cooling capacity will almost certainly be sufficient for any mods. Use WaterWetter as coolant to improve cooling, -it reduces cavitation.
The question is, will it fail?
No coolant does any good after leaking out.

You can take some precautions by checking the reputation of the brand, the condition of the item such as state of welding or damage if any. If you take a chance with a cheapy, keep an eye out for leaks, and above all, carefully monitor coolant temperature. If any doubts, install another temperature gauge.