Performer manifolds are dual plane, low rise intake manifolds with a 180 Degree firing order and patented runner design that you won't find in other brands. This patented design greatly improves torque over a wide RPM range for excellent throttle response, especially off idle through the mid range. Performers are ideal for passenger cars, trucks, 4x4s, tow vehicles and RVs. There are EGR and Non-EGR versions available for most domestic V8 and some V6 engines. Most Performer intakes are 50 state street legal, when used with the correct carburetor and in the correct application