We stand behind all of our new products with our 12 month/unlimited miles warranty. Our performance gasoline injectors come with a limited lifetime warranty but does not include our 2200cc injectors. Within 14 days of your purchase date if you are not 100% satisfied, we will refund your purchase price for returned unused fuel injectors in their original packaging, minus shipping costs and a 5% restocking fee. If you ever have an injector go outside specification or fail for any reason when functioning within the stated operating conditions, we will replace it with a new re-manufactured fuel injector. You pay only the shipping costs. (All racing applications will void this warranty).