The B18c4 is a DOHC VTEC 175bhp......its a hydro tranny too.
It is like a B18c only w/o the high compression, double valve springs, less aggressive cam profile and differant intake manifold.
Its found in the 1.8vti 5door civics in the uk.........from 1998 onwards it comes with a LSD in the S9B tranny.

The Y21 is just out of the 1994 civic vti with a b16a2.