how to tell the diff. between 1g and 2g manifolds

[93_GSX_AWD]

i picked a 2g manifold from a guy i met. and i am not sure how to tell if it is a real 2g manifold. i couldnt find any markings on is there a way it looks different. cause i wanna get it ported and dont wanna spend the money on getting it done if its a 1g. any help will be helpfull

thanx
travis