Overview Reviews Product Description 558-437 Holley EFI Hemi Drive-By-Wire Throttle Body Harness The Holley Dominator ECU has built in capability to control the Drive-By-Wire throttle pedals and throttle bodies used on most Chrysler HEMI applications. Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-437 Holley EFI Hemi Drive-By-Wire Throttle Body Harness Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *