2.5 inch is one of the most common pipe sizes on four-cylinder performance builds and many 4WD utes, making it a frequent fitment for catalytic converter replacements. We stock 2.5 inch cats in both 100 cell and 400 cell options, so you can choose based on whether performance flow or emissions compliance is the higher priority for your vehicle.

How do I know if I need a 2.5 inch catalytic converter?

Measure the inside diameter of your existing exhaust pipe at the cat location; 2.5 inch is a common size for four-cylinder and many mid-size performance systems.

Can I fit a 2.5 inch cat to a system with a different pipe size?

Yes, using a reducer, but it's best to match sizes where possible to avoid unnecessary flow restriction at the joint.

What cell counts are available in 2.5 inch catalytic converters?

We stock 2.5 inch cats in both 100 and 400 cell options, so you can choose based on performance versus emissions priorities for your vehicle.

Will a 2.5 inch cat fit my 4WD ute?

Many 4WD utes run 2.5 inch or larger systems, so check your model's factory pipe diameter before ordering to confirm it's the right fit.