K-series factory injector sizes….
270cc Injectors:
- K20A3 (RSX Base + EP3 Civic Si)
- K24A1
- K24A3
- K24A4
310cc Injectors:
- K20A
- K20A2
- K20Z1
- K20Z3
- K24A2
410cc Injectors:
- K23A1 / RDX (uses different style connector vs typical 270/310cc K-series injector connectors)