Ignition/Tuner/ECM/Fuel InjectionNeed advice on ignition issues? Questions about a tuner? Have questions about a EFI calibration or Fuel Injection? Tips on Engine Diagnostics, how to get codes, and what they mean. Find your answers here.
Have to is subjective. You can certainly run any exhaust without a remap. But it might run like ****, especially going from 2-2 to 2-1 pipe and vice versa.