Not sure if this was mentions as I just skim read through this post and did not see it but I believe the stock z radiator cap is about 14psi (Just going from memory and would have to actually check) which is pretty typical for NA but is a little low to what I normally see for stock turbo cars it's more typical to see 18-20ish psi. This raises the boiling point of the system. The risk becomes wether or not the stock z cooling system can take the extra pressure.
Just something to think about if not already mentioned or done.
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