This header collector set takes the place of messy three-bolt flange-type connections and allows for a leak-free and gasket-free ball-flange type connection.Made in USA Emission Note:50- State LegalThis part is legal for sale or use on Emissions Controlled Vehicles Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.