Adding a set of headers to a late-model, computer-controlled car can have good and bad effects on the vehicle's performance and operation.

To appraise the value of a catalytic converter from highest to lowest by make/model, you can follow these steps: 1. Material type. 2. Emission laws. 3. Research the current market value of the precious metals in the catalytic converter. 4. Consider the condition of the catalytic converter. 5. Manufacturing differences.

Regeneration, or regen, of the DPF filter, is the process that burns the soot accumulation that is inside the DPF filter. Educating yourself on what forced regeneration is and how it works will help you understand your after-treatment system better.