plastic intake manifold repair

Question: has anyone here ever tried to repair an intake for a 2000 16 valve engine with JB weld? And, does anyone here know the composition of the plastic used in said manifold? Your help is greatly appreciated. FYI, I'm trying to Hot Rod one of these for a Bonneville run and would like to install nitrous ports directly into the manifold runners. :screwy: Yeah, that's me.