Kooks Headers and Exhaust products are covered under our limited lifetime warranty. This warranty is limited to the repair or replacement of the product if the problem is due to faulty materials or workmanship. The warranty does not cover any coatings, polishing, painting, etc. and will NOT cover any re-coatings, re-polishing, or re-paintings to the headers. Kooks will not warranty any exhaust product that has been improperly installed, crashed, welded, or modified (coatings, header wraps, etc) in any way. Kooks will not cover damage to any related components. Neither the seller, nor Kooks, will be responsible or liable for any loss, damage or injury resulting from the direct or indirect use of this product or inability by the purchaser to determine proper use or application of this product. Kooks Headers and Exhaust products are built for off-highway use only and disclaim all liability for products used in racing activities and/or applications other than those specifically recommended in the current catalog. Claimed defective products must be returned with a Returned Merchandise Authorization (RMA) number to Kooks at the buyer’s expense. Products returned without an RMA number are subject to refusal. The returned product will need to include your name, address, daytime phone number, RMA number, and a copy of your sales receipt if available. Warranty will not be considered without a copy of your sales receipt. Upon receipt, Kooks Headers and Exhaust will, at its option, repair or replace the defective item. KOOKS MUFFLERS Kooks Headers and Exhaust Mufflers come with a 2 year limited replacement warranty. The muffler in question will need to have an Returned Merchandise Authorization (RMA) number and follow the same warranty return policy as stated above. Once the product is received by Kooks, it will be evaluated to determine the reason for failure. If cause of failure is determined to be impact damage, the claim will be denied. If it is a defective part that caused the failure, then the said muffler will be replaced and shipped back to the consumer at no charge. If it is determined to be an issue other than part failure, then we can offer a replacement muffler at a discounted rate. CATALYTIC CONVERTERS Vehicles equipped with a factory supercharger or turbocharger will only receive a warranty on Kooks Catalysts if they have the GREENCATS. There will be no warranty on our standard high flow catalyst if the vehicle comes equipped with a factory forced induction system. Furthermore, we recommend upgrading to the GREENCATS if your application will be producing more than 600 horsepower. GREENCATS can be installed on any of the Kooks exhaust systems. Example: A Ford Mustang GT500, which comes equipped with a supercharger from Ford, will only receive a Kooks-backed warranty if they are running the GREENCATS. Kooks Headers and Exhaust EPA-Certified GREENCATS come with a 2-year limited replacement warranty. The standard High Flow Race Catalyst come with a 1-year limited replacement warranty. The catalyst in question will need to have a Returned Merchandise Authorization (RMA) number and follow the same warranty return policy as stated above. Once the product is received by Kooks, it will be evaluated to determine the reason for failure. If it is a defective part that caused the failure, then the said catalyst will be replaced and shipped back to the consumer at no charge. If it is determined to be an issue other than part failure, then we can offer a cat replacement program at a discounted rate. 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.