Pypes black powder coated stainless steel light duty products carry a 1 year warranty. Pypes stainless steel light duty products carry a limited lifetime warranty. If your truck has an engine that is 2007+, any yellowing, blueing, corrosion, or cracking is not covered under the manufacturer warranty. 2007+ engines burn rich and much hotter than pre-2007 engines. Because of this, these Stacks are not warrantied when using on trucks with DPF or DEF systems. For warranty claims, please call Pypes directly at 1-800-421-3890 Ext. 106. For Damage claims and additional questions, please give us a call.