Im curious..I do alot of driving..and i have the b18c1 in my civic si..and I wonder if the small radiator will do the job of keeping everything from overheating..Should I get the fullsize radiator? if so..please tell me what I should get... thanks

 

I think you should be fine but then again the civics uses the smaller radiator because it has a smaller motor. If your not driving it that hard it's ok but if you are then you should use a bigger radiator. And where you live makes a lot of difference. Meaning if you live in a hotter climate then you should use bigger radiator.
If you still want to use smaller radiator, use the performance radiator. It cools a lot better.

 

i have this setup and never had a problem. until i hit rocks and killed the radiator leaked everywhere. replaced with an all aluminum half size radaitor(stock size). works awesome