Edelbrock heat exchanger part # 15408 is a dual pass/single row design and delivers 55,000 btu/hr. Includes a 3/4" 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 (34"W x 14"H x 2.25"D) with 4 threaded bungs. Edelbrock offers a wide selection of Universal Heat Exchangers to work with the E-Force Universal or Enforcer Supercharger systems. Edelbrock heat exchangers offer reliability and durable construction for high performance street applications.