Used aluminum strip metal from home depot. I cut, bent, and sanded the corners round so there was no sharp edges. I also used some brazing rod and some aluminum strips to fab up a couple hangers for my coolant resivour. Also I brazed reinforcements on my intercooler brackets to make them stronger. Brazing is a little time consuming than just making brackets, but it is much less expensive than welding if you do not have the proper supplies and skills.