Sorry for the noobness, but i read that aluminumized steel is steel coated with alluminum. I am looking to build my own exhaust, im going to be buying the pipe locally (steel) and the mandrel bends from summit, thing is, the ones i want to buy say "aluminumized steel". Can these be welded strait to steel or do i need regular steel bends? Does stainless only weld to stainless and does it require some sory of special welding? THanks a bunch.