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Doug Thorley Shortie Headers are designed with ease of installation in mind. Many late model applications do not allow use of a Tri-Y or Long Tube design because of emissions compliance standards. In those cases, Doug Thorley Shortie design is utilized in all RPM ranges for maximum performance while maintaining EO compliance and approval. 50 state legal – adheres to strictest emission standards. Industry leading 3/8" flanges and 14 gauge tubing. These Doug Throley Shortie Headers for Chevy/GMC, Dodge, Ford, Hummer, Jeep, Nissan, and Toyota are all 100% made in the USA and backed by Doug Thorley's lifetime warranty.