Overheating

:
2002 Mazda Protege5
Busted the radiator today. Small leak, plugged it with stop leak, but it's still overheating. My guess is the thermostat broke? Getting a metallic rattling sound as well, not sure where from, more apparent during acceleration. Thoughts?
 
I replied to your build thread a minute ago.

The rattling could be preignition, which is worsened by a hot engine.
 
I think I'm going to be replacing both the thermostat and water pump, just for good measure. Just wondering if it's worth getting the Mishimoto radiator, I'd have to buy the transmission oil cooler as well since that's separate for the automatics
 

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