Overview Reviews Product Description 557-200 Holley EFI 3 Port Solenoid Valve 3 Port Boost Control Solenoid ValveIncludes: (1) solenoid, (1) ECU pigtail harness with factory crimped ECU pin, (3) 3/16" barb fittings, (1) 1/8" NPT plug, (1) Sintered brass muffler. and (1) spare ECU pin for modified harness lengths. Product Videos Custom Field Product Reviews Write a Review Write a Review × 557-200 Holley EFI 3 Port Solenoid Valve Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *