Includes: Cast, large-bore brake housing; High-force, 4" vacuum actuator; Computerized Brake Controller (CBC); Large butterfly valve with super-alloy shaft-and-bearing system; Stainless, 3.5" Monster T.O.P. turbine-outlet pipe (or optional 3" to connect to stock exhaust) with ceramic-matrix heat shield; In-dash switch; Wire loom; Mounting hardware; Comprehensive Owner's Installation Manual