Catalytic Converters

Catalytic Converters: direct-fit replacements and high-flow upgrades for the exhaust stream

A catalytic converter sits in the exhaust between your headers or manifold and the muffler, using its internal substrate to convert the raw gases the engine produces into cleaner ones before they leave the tailpipe. Most people buy catalytic converters for one of two reasons: the original one has failed, rattled apart, or thrown a code and needs replacing, or they are building a freer-flowing exhaust and want a higher-flow cat that suits headers and a cat-back setup. Either way, it bolts in between your headers and the rest of the system, and the flanges and oxygen-sensor bungs have to line up with your car.

What ThreePiece stocks

This category holds 187 catalytic converters from 5 brands. Magnaflow makes up the bulk of the range at 176 products, with aFe (4), Turbo XS (3), Kooks Headers (3) and BBK (1) filling out the rest. Prices currently run from $109 to $2,451 for what is in stock right now — that is the live range, not a fixed quote. At the upper end you will find pieces like the MagnaFlow direct-fit for the 86-93 Ford Mustang 5.0L and the MagnaFlow underbody unit for the 20-21 Ford Transit-150 3.5L. Fitment data is attached to 102 of these parts, covering model years from 1986 to 2021 across makes like Ford, Honda, Toyota, Nissan, Jeep, Mazda, Chevrolet and Dodge, and vehicles including the Honda Accord, Ford F-150, Jeep Wrangler, Toyota Tacoma and Mazda RX-8.

How to choose

The main split is direct-fit versus high-flow. A direct-fit converter is built to match a specific chassis so it drops into the factory location with the original flanges and sensor ports — the aFe 409 stainless front-left cat for the 05-11 Tacoma V6 and its front-right pair are good examples of a side-specific replacement. High-flow options like the Kooks 3in green cat or the BBK high-flow mid-pipe with converters for the 09-23 Ram 1500 5.7L are aimed at built engines and freer exhaust flow. Match the converter to your exact year, make and engine, and confirm whether your car needs a left, right, or single unit before ordering.

What else you need

A converter is one link in the chain. If you are refreshing the whole run, look at Cat-Back Exhaust, Cat-Back Systems and Full System Exhaust. For the sections around the cat, browse Exhaust Pipes and Exhaust Flanges to get the connections right, and Mufflers if the old one is tired. Everything sits under the main Exhaust section.

Fitment and ordering

Not sure which converter matches your setup? Call fitment help at 813-535-5801. Every order ships free, and Affirm and Katapult financing is available on the pricier direct-fit and high-flow pieces.

Catalytic Converters: direct-fit replacements and high-flow upgrades for the exhaust stream

A catalytic converter sits in the exhaust between your headers or manifold and the muffler, using its internal substrate to convert the raw gases the engine produces into cleaner ones before they leave the tailpipe. Most people buy catalytic converters for one of two reasons: the original one has failed, rattled apart, or thrown a code and needs replacing, or they are building a freer-flowing exhaust and want a higher-flow cat that suits headers and a cat-back setup. Either way, it bolts in between your headers and the rest of the system, and the flanges and oxygen-sensor bungs have to line up with your car.

What ThreePiece stocks

This category holds 187 catalytic converters from 5 brands. Magnaflow makes up the bulk of the range at 176 products, with aFe (4), Turbo XS (3), Kooks Headers (3) and BBK (1) filling out the rest. Prices currently run from $109 to $2,451 for what is in stock right now — that is the live range, not a fixed quote. At the upper end you will find pieces like the MagnaFlow direct-fit for the 86-93 Ford Mustang 5.0L and the MagnaFlow underbody unit for the 20-21 Ford Transit-150 3.5L. Fitment data is attached to 102 of these parts, covering model years from 1986 to 2021 across makes like Ford, Honda, Toyota, Nissan, Jeep, Mazda, Chevrolet and Dodge, and vehicles including the Honda Accord, Ford F-150, Jeep Wrangler, Toyota Tacoma and Mazda RX-8.

How to choose

The main split is direct-fit versus high-flow. A direct-fit converter is built to match a specific chassis so it drops into the factory location with the original flanges and sensor ports — the aFe 409 stainless front-left cat for the 05-11 Tacoma V6 and its front-right pair are good examples of a side-specific replacement. High-flow options like the Kooks 3in green cat or the BBK high-flow mid-pipe with converters for the 09-23 Ram 1500 5.7L are aimed at built engines and freer exhaust flow. Match the converter to your exact year, make and engine, and confirm whether your car needs a left, right, or single unit before ordering.

What else you need

A converter is one link in the chain. If you are refreshing the whole run, look at Cat-Back Exhaust, Cat-Back Systems and Full System Exhaust. For the sections around the cat, browse Exhaust Pipes and Exhaust Flanges to get the connections right, and Mufflers if the old one is tired. Everything sits under the main Exhaust section.

Fitment and ordering

Not sure which converter matches your setup? Call fitment help at 813-535-5801. Every order ships free, and Affirm and Katapult financing is available on the pricier direct-fit and high-flow pieces.