Holley EFI LS Main Harness to LS3-style MAP Sensor Adapter 1999 Pontiac Firebird Maximum dyno gains of 12

Maximum dyno gains of 12 hp and 13 lb-ft were measured at the rear wheels

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Holley EFI LS Main Harness to LS3-style MAP Sensor Adapter 1999 Pontiac Firebird Maximum dyno gains of 12Holley EFI LS main harnesses have a MAP sensor connecter designed for use with an LS1 2 style MAP sensor. The 558 416 is an adapter harness that can be used to adapt any LS harness that uses an LS1 2 MAP sensor connection to an LS3 MAP. Also great for use with LS Hi Ram intakes that require an LS3 MAP sensor.