This is a "Factory Replacement Custom Fuel Injector Harness" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This harness is a direct replacement for the factory fuel injector wiring harness. This injector harness is longer than the factory harness. The added length allows you to neatly tuck all the wiring under the manifold. Also a great feature for a taller champion manifold. This harness also features custom shrink tubed wiring unlike the tradition electrical taped up harnesses.