| ACFM | | | Actual Cubic Feet per Minute (references exhaust flow rate) |
| AFRC | | | Air Fuel Ratio Controller |
| CAS | | | CleanAIR Systems |
| CL | | | Closed-Loop |
| dBA | | | Decibel Adjusted (refers to sound attenuation level of silencer units) |
| DC | | | Dosing Cabinet (for E-POD) |
| DOC | | | Diesel Oxidation Converter |
| DPF | | | Diesel Particulater Filter |
| EPOD | | | Emissions Permitting Operational Device |
| ESA | | | Engine Sensor Assembly (for E-POD) |
| OC | | | Oxidation Converter (also known as a two-way converter) |
| OD | | | Outside Diameter |
| OL | | | Open-Loop (for E-POD) |
| SCR | | | Selective Catalytic Reduction |
| TWC | | | Three-Way Converter |
