So do i go OEM and run a copper core or an aluminum core? What i have always thought is aluminum is better, it cools better etc. But what actually cools better, what material can disipate heat better aluminum or copper? I know copper weights more, then aluminum. I think that aluminum rads are used for weight savings only, and copper actually works better then the aluminum just weighs more, but aluminum does the job fine. Just a though, any input?