Some items from this specific schematic: Bolt,flange,6x14, Joint,brthr Chbr, Clamp,d17 Tube, Set,brthr Chamber.
The most reasonably priced component used on the Civic 1989 (k) 4dr Lx (ka,kl) Breather Chamber is the Bolt,flange,6x14.
The most expensive part in this assembly is the Set,brthr Chamber.