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Hi all

    Seeking net wisdom on comparison of radiator made from aluminum vs. 
copper-brass that's found on the stock Audis. My understanding is that 
aluminum can dissipate heat better, however, it's less resistant to thermo-
expansion and contraction and therefore, more prone to crack. For two 
radiators of identical external dimensions, can one get more cooling by going 
with the original copper-brass one but with more tubings of smaller diameter  
or are you still better off with an aluminum one that is identical to the 
original one with the same size tubing ?
Thanks in Advance