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What is a Cat?

A Catalytic converter takes the hydrocarbons (unburned fuel) produced by the engine and converts those toxic gases into water and carbon dioxide.

  • Helps remove harmful emissions from exhaust

  • Catalytic Converter Certified to EPA Standards

  • Elimination of check engine light not guaranteed

  • Rated for up to 425 Horsepower per Cat

  • Ok for use with Forced Induction

What’s the difference between the standard cat and the kooks green cat?

These two cats are physically the same, and both use the same 300 cell high-flow substrate. The difference is in the coating that is applied to the substrate. The coating on the Kooks GREEN Cat has more of the precious metals required to create the proper reaction to function as a catalytic converter in newer vehicle exhaust systems. This coating also helps the cat withstand the increased heat in higher horsepower and forced induction applications. The standard cats carry a 1-year limited replacement warranty (No warranty if used in a forced induction application). The Kooks GREEN Cats carry a 2-year limited replacement warranty.

purchase a green cat, a tree is planted

OneTreePlanted Logo

Kooks has teamed up with OneTreePlanted, an environmental charity focused on global reforestation. For every GREEN cat purchase from Kooks, a tree will be planted in California, Oregon & Appalachia.

OneTreePlanted is a 501(C)(3) non-profit organization that is dedicated to helping the environment by planting trees worldwide with the help of individuals and businesses to create a healthier climate, protect biodiversity and helping reforestation efforts. With each tree that is planted, it helps to restore forests after fires and floods, it creates jobs and builds communities on a global level and it helps protect natural habitats for biodiversity. Just in 2019 alone, over 4 million trees were planted worldwide!

Kooks Ultra-GREEN Cats

Warning / California (Proposition 65)

Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm. These chemicals can be in the products that Californians purchase, in their homes or workplaces, or that are released into the environment. By requiring that this information be provided, Proposition 65 enables Californians to make informed decisions about their exposures to these chemicals. 

Proposition 65 also prohibits California businesses from knowingly discharging significant amounts of listed chemicals into sources of drinking water. 

Proposition 65 requires California to publish a list of chemicals known to cause cancer, birth defects or other reproductive harm. This list, which must be updated at least once a year, has grown to include approximately 900 chemicals since it was first published in 1987.

For more information, please visit

Warning / California (CARB)

California laws prohibit the use of any aftermarket exhaust part or system that modifies, removes or replaces original equipment catalysts unless the California Air Resources Board has issued an Executive Order regarding such part or system or unless the part or system is exempted by being used only on racing vehicles on closed courses. Neither Kooks Headers and Exhaust nor any of their subsidiaries make any representation that any of their parts or systems has received such an Executive Order or that any of their parts or systems conform with the racing vehicles exemption. The purchasers are entirely responsible for informing themselves of applicable California laws and to comply with those laws.

Unauthorized Vendors

Kooks products purchased through any unauthorized vendor (including but not limited to): Amazon and Maryland Speed will not be warrantied by Kooks. Likewise, returns from any unauthorized vendor will not be accepted by Kooks.

Continue With Jet-Hot

Products that receive jet hot coating are not eligible for exchange or return and excluded from additional discounts. Would you like to continue with your purchase?