EM is the chassis code for the 2001-and-up Civics. It's a significantly different design than the previous EK Civics, with a MacPherson strut suspension, a highly modified rear double wishbone suspension, a firewall-mounted steering rack, and numerous other changes.
DC5 is the chassis code for the RSX. It's a significantly different design than the previous DC2 Integra, with a MacPherson strut suspension, a highly modified rear double wishbone suspension, a firewall-mounted steering rack, and numerous other changes.
Forgive us for the redundancy, but that's the point. It turns out the RSX and Civic are virtually identical under the skin. And despite the radically different powerplants--with the Civic soldiering on with the tried-(but tired) and-true D-series engine--they aren't that different. Gillespie noticed this early on, and realized there had to be a way to swap the powerful K20A2 into the weak-kneed D17's home.
I found this artibcle at this web site(ttp://www.hondatuningmagazine.com/features/0301ht_heart/)
it has pics of what the swap looks like afterwards.