i have question about intake manifold, my car is D15B civic with DPFI i whant change and set MPFI what do i need to replace DPFI to MPFI? do i need new ecu with HARNESS

 

Harness, no. It's recommended but not necessary. ECU, yes. If you don't get an ECU for an MPFI car, your stock ECU will still try to operate off of the two injectors/butterfly valve from the DPFI manifold. You WILL need an MPFI distributor, ECU from an MPFI car, wiring and possibly an injector resistor box (I've done this on EFs before not 92+). Head over to the FAQ section in the CRX/EF forum and there should be at least 3 different write ups.