Direct-Fit Catalytic Converters

Want to replace a faulty catalytic converter without cutting, welding and modifying pipes? Direct-fit catalytic converters are designed for specific car models and mount to the original hangers and flanges. This category is for you if you want to replace a worn original part with a ready-made fit.

What is a direct-fit catalytic converter?

A direct-fit catalytic converter is shaped like the original part, so the pipe routing, flanges and brackets typically fit the car it was made for. That sets it apart from universal catalytic converters, which normally have to be modified and welded in. In this category you will find both underbody catalytic converters and manifold catalytic converters that sit close to the engine. Brands in the category include Magnaflow, aFe, HKS, Remus and Flowmaster.

How to choose the right catalytic converter

Fitment depends on car model, model year, engine and often the drivetrain as well. So check the part number against your car before you order. Pay particular attention to:

• Position: underbody, manifold or right/left side on cars with multiple catalytic converters.
• Engine and model year: for example, there are versions for the Ford F-150 with the 3.5L V6 and the Subaru WRX with the 2.0L.
• Oxygen sensors: where they are located and whether the original sensors can be reused.
• Approval: whether the catalytic converter is road legal depends on the product and the car and must be checked for the specific part number.

Installation and maintenance

Because the part is shaped like the original, it can often be installed using the existing hangers, but new gaskets and bolts may be needed, especially if the old ones are rusty. A new catalytic converter does not remove the reason the old one failed: misfires, oil consumption or an overly rich mixture can damage the new one too. So have the engine checked first. You will find more types under catalytic converters.

Frequently asked questions

What is the difference between a direct-fit and a universal catalytic converter?

A direct-fit catalytic converter is shaped for a specific car and typically mounts to the original hangers. A universal catalytic converter normally has to be modified, shortened and welded into the exhaust.

Will my car pass inspection with a direct-fit catalytic converter?

That depends on the product and the car. Check the approval for the specific part number, and whether it meets the requirements of your car's emissions standard, before you install it on a car used on public roads.

Why did the old catalytic converter fail?

Typical causes are misfires, oil or coolant consumption and an overly rich mixture, which can overheat or clog it. Find and fix the fault before you install a new one, otherwise the new one can be damaged in the same way.