Custom making intake manifold

[s383mmber1]

What would be a good size to use? I was thinking 4.5 inch inner diameter Aluminum. Would this be an appropriote size? Would a thickness of .120 inches be thick enough to weld? Its 11 gauge aluminum....

Would 5 inches be more appropriote?

Thanks guys!

 

[2543arvin]

Quake is making one with 4" piping, you could PM him about any questions you have.

 

[madsupra88]

4.5 is plenty .