A good choice, when you plan to create your own cooler is to buy an aftermarket cooler from a truck.
Me and a friend of my buyed a big cooler from a truck then we tear it apart and made two coolers of it.
Just check for a cooler thats fit your flow, lag, pressure etc.
And I would say go for the TIG nothing else gonna work I think.
Here´s some pics from our coolers, and we made it with a TIG.
To badly it shows up that the cooler was to big for my Porsche but it shows some pic on the other cooler we build.
Good Luck!
/Jocke
