The TC4 is very modable, change the top and you can have a centre inlet over the die with twin outlets, you can put a jet in the centre drill some dimples over the die area and have impingment cooling. you can't do anything with a maze3, I've got one and tried
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I'd wait a while and see what happens with the US WW, have you tried PM'ing Cathar to see if he has any news?...