Edelbrock heat exchanger part #15408 is a dual pass/single row design and delivers 55,000 btu/hr Includes a 3/4in. barbed inlet and outlet for plumbing, along with M6x1.0 threaded bungs for mounting. Heat exchanger part #is a Dual Pass/Single Row Universal Heat Exchanger with the following dimensions (34in. W x 14in. H x 2.25in. D) with 4 threaded bungs. Edelbrock offers a wide selection of Universal Heat Exchangers to work with the Edelbrock Universal or Enforcer Supercharger systems. Edelbrock heat exchangers offer reliability and durable construction for high performance street applications.