The stock mazda cooler is steel right, not aluminum? Would be easier to weld...
Welding is not an issue, I have the tools and welders

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In regards to fittings, I thought that most of the Porsche stuff was AN12? Any point in welding in a AN16 (isn't that huge?)
Also, I thought most AN fitting I see for sale are aluminum, no? Do they make them in steel?
I am very tempted to buy this cooler for $80. Trying to figure the downside, and the major concern would be burst pressure. Perhaps they made it of very thin aluminum?
Bo