correct, they are plastic, i had a ls and was just about ready to run a 75 shot of nos in it before i traded it in. There is one guy that did blow it but that is because he was at the drags and did not have a windows switch (not to smart) so he sqeezed to early. looked like a firball.hehe anyways there should not be an issue with the manifold because with a turbo set up you are not going to see any real boost untill the mid RPM range. a supercharger would work as well, but i dont think i would run it at very high boost. I have been contimplating running a 50 shot in our aveo, i think it can be done. i might be working on this soon. i will keep you guys updatedOriginally Posted by khan4rtist