Quote Originally Posted by WaterFlex View Post
Copper does more performance but has less corrosion resistance? Nikel does less performance but has more corrosion resistance?
I think this block is good http://www.aquatuning.de/product_inf...70-Nickel.html

I have Feser One coolant btw
the nickel plating on the copper is so thin it wont hurt performance. what the cover is made of doesnt matter, so all 4 versions will perform the same. IF you have aluminum in your loop, i'd strongly recommend either nickel one, but if you dont the copper is fine too. from your sig i can conclude you have only copper, so just pick the one that looks best.