If you are talking about the difference between the Type S and the Base Model RSX. On top of my head of the 02-04 model

- Side Skirts, Base are not painted.
- Rotors, Type S has bigger rotors
- Engine Code: K20A3 (base) K20A2 (Type S)
- Base does not have real vtec.
- Type S only comes in Standard
- Type S has a base in the rear.
- Exhaust: The size is different, Type S has bigger exhaust.
- Color Codes: EBP and TW only comes in Base, other will have both Base and Type S.