Marine City, MI, (April 11, 2019) – Howell EFI, long been known as a leader in EFI conversions since the late 1980’s beginning with GM TPI conversions, GM TBI conversions for Jeeps, and 90’s LT1 conversions now offers LT/EcoTec 3 conversion harnesses and accessories for GM direct injection swaps. Over the past two decades Howell added the…