Material for Turbo Manifold.

["Tom Neimeyer" <tneimeyer@houston.rr.com>]

I am wanting to make a turbo manifold for our motorcycle.  It will be out of
aluminum.  What type or grade of aluminum is acceptable?  Does anybody know
what type of aluminum the fuel injection "bungs" or "couplings" are made
from?  How compatable are the various forms of aluminum when it comes to
welding them together?

Thanks, Tom