1998 Dodge B1500 3.9L Direct-Fit Catalytic Converter 4451295 Magnaflow charging-and-starting-systems This tells the ECU which

This tells the ECU which cylinder is cylinder #1 (or the first cylinder in the firing order as entered in the software)

Without Sahara or Rubicon Package Textured Black 3-3/4

6L V8 1970 - 1972 GMC C15/C1500 Suburban   402/6

4 V8 1997 Ford E-350 Econoline Club Wagon 415/6

1998 Dodge B1500 3.9L Direct-Fit Catalytic Converter 4451295 Magnaflow charging-and-starting-systems This tells the ECU whichMagnaFlow California Grade CARB Compliant Direct Fit Catalytic Converter 4451295 helps keep the check engine light off. DIY installation is easy with the proper tools (no cutting or welding required). With features including mandrel bent tubing to eliminate flow restrictions and stainless steel construction to resist corrosion, you can have confidence in the quality of this catalytic converter. Using state of the art 3D scanning systems in the design