Difference between H, E, and S compressor housings for a turbo?

[86_sports_1jz]

just wondering what the difference bwtn the different compressor housings were for a E, H, and S compressor housing?

 

[tissimo]

I dont remember exactly but E is 3" intake 2" out H is 3" intake 2.5" out and s is 4" intake 2.5" out ..

 

[Ric]

I know Q and S trim has to do with non BB and BB turbo, at least for precision turbo.