WALKER® EXHAUST SYSTEMS :: What is a Catalytic Converter

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WALKER® EXHAUST SYSTEMS: What is a Catalytic Converter

The catalytic converter is designed to convert harmful emissions, produced by an internal combustion engine, to less-harmful elements: H2O (Water), CO2 (Carbon Dioxide) and N2 (Nitrogen).

To perform this conversion, the catalytic converter works with a vehicle's PCM (Powertrain Control Module) and other emissions control devices.

OBDII (On-Board Diagnostics Version 2) monitors the emissions control devices and provides feedback on their operating condition.

As the EPA (Environmental Protection Agency) updates emissions standards, the OBDII system becomes more sensitive to fluctuations in emissions performance.

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STAINLESS STEEL BODY

For long life and durability. The ribbed body minimizes expansion and distortion, as well as forming channels that protect the cushioning mat from direct exposure to exhaust gases.

MONOLITHIC FREE-FLOWING SUBSTRATE

The substrates are the backbone of the converter. This is where the proprietary mix of precious metal(s) and the washcoat formulated to store O2 allow the conversion process to take place. Converters are available in single- or multiple-substrate designs.

CATALYST CUSHIONING MAT

The mat cushions the converter substrate, holding the ceramic catalyst in proper alignment. Creates a seal between the substrate and body, making sure all exhaust goes through the catalyst. Allows for thermal expansion of the body.

BODY AND PIPE HEAT SHIELDS TO MATCH OE

Deflects heat created by the converter away from the vehicle's undercarriage.

O2(OXYGEN) SENSORS

Another vital part of an emissions control system. These sensors are placed before and after the catalytic converter on an OBDII vehicle. They are designed to monitor the O2 storage efficiency of the converter. This information also allows the PCM to adjust fuel controls.