DPFI= DUAL POINT FUEL INJECTION (means you have 2 injectors)
-Basically any CRX from 1988-1991 that was a DX is DPFI, and Civic Hatchback from 1988-1991 that was a DX

MPFI=Multi Point Fuel Injection (Means you have 4 injectors)
-Any CRX 1988-1991 that was a HF or SI model, any honda after 1991 was MPFI