If this is related to the other thread i.e. inlet manifold/intercooler piping then don't even bother trying. Yes with the right gas etc it'll be capable on paper of welding ally. In practice it ain't powerfull enough (the cast side) and thin ally with a basic MIG ain't fun, tube... even less so. Thin wall tube to a chunk of cast ally when the welds need to be air tight... Forget it.