3 Inch Catalytic Converters

Unlock the true potential of your high-performance engine with a 3-inch high flow catalytic converter. Specifically engineered for systems where airflow is paramount, these 3" (76.2mm) converters provide a significant upgrade over restrictive factory units. By utilizing an advanced metallic substrate rather than traditional ceramic, they offer superior durability under extreme heat and vibration. Whether you’re finishing a turbo-back system for a Nissan Patrol Y62 or a custom dual 3" system for a V8 Commodore, our 3-inch converters deliver the gas velocity and reduced backpressure needed for peak horsepower gains.

Is a 100 cell or 200 cell 3-inch cat better for my car?

A 100 cell converter has larger openings, offering the least resistance and highest flow—ideal for track or maximum power builds. A 200 cell converter provides slightly more filtration and is often the preferred choice for high-performance street cars to balance flow with emission reduction.

Can these 3-inch converters be used on diesel vehicles?

Yes, these universal high-flow metallic cats are suitable for many high-output diesel 4WDs. However, for modern diesels with strict DPF (Diesel Particulate Filter) requirements, ensure the converter is compatible with your specific emission control strategy.

Do these 3-inch catalytic converters come with oxygen sensor bungs?

Many of our 3-inch units, specifically the MSA and Viper ranges, come with a pre-installed O2 sensor provision. This makes it much easier to reinstall your factory sensors to monitor catalyst efficiency and prevent engine fault codes.

Will these 3-inch high-flow cats fit any vehicle?

These are universal fitment components, meaning they are designed to be welded into any 3-inch exhaust system. Because they are compact (often around 190mm to 280mm in length), they can typically be integrated into custom headers, dump pipes, or mid-sections with professional fabrication.