ORIGINAL: bkdavy
My experience with Alumiweld is that its melting point is too low for effective use on exhaust systems. Find a local weld shop that will do TIG. They'll probably just fit it between jobs or have someone thats learning the process do it for you. Make sure you tell them you don't want any pores in the final weld or you'll eventually have an oily mess inside the cowl from leakage through the weld.
Brad
In other words Brad you're saying that one will not get the required penetration for the weld because the Alumiweld will melt and burnoff before the base becomes hot enough to accept the weld? Good point. TIG is the better way to go.
Mike