Overview Reviews Product Description 558-409 Holley EFI Sealed USB Data Cable 7' long sealed USB data cable. This cable is included with the purchase of an HP or Dominator ECU. Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-409 Holley EFI Sealed USB Data Cable Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *