Street Avenger carburetors are known to bolt on right out of the box. The 500 CFM Street Avenger carburetor has great features such as optimized street calibrations; three vacuum ports for all necessary vacuum accessories; factory preset electric choke for easy startups; built-in fuel filters; and an included 3/8 in. fuel line connection so there are no unnecessary trips back to the parts store. The Avenger series are the first carburetors to have a limited lifetime warranty. With a great warranty like that and the included comprehensive instruction manual, you can count on years of worry free service.