*Constructed from 6061 T-6 billet aluminum. *1/2" I.D. for ultra high flow, high horsepower applications. *Complete kit for direct bolt-on to stock or modified vehicles. *Allows connection to stock or modified vehicles. *Includes AN fittings and brackets. *Rails are machined for -6 O-ring fittings. *Polished/blue anodized finish for Mustang applications.