Whats the intake manifold on this model made of, and is it a straight or angled/curved pitch?

Asking as ive been having some start up issues on my Lexmoto Lowride (Identical K157FMI engine) and discovered a small hole on the intake manifold yesterday, patched it up to get the bike started, today its now a big hole so another day or so and itll be useless.

Just got onto the dealer as the bike is under warranty, but not to struck on them replacing it with the same make\model part.