not sure if u guys have heard of an australian company called HYPERTUNE?
they make 3 piece billet plenums and the great thing about them being 3 piece is it makes it so much more easy to match port to the cylinder head
basically u unbolt the flange plate of the runners and bolt it onto ur cylinder head and port them both together for the perfect match port instead of match porting to the gasket like u normally do
here are some photos of there SR20 plenums they have on the market
