
I ordered these for my 2000 GMC Sierra 5.3L 4X4. It has a 2nd generation coil design (with heatsinks on top). They came with a small packet of dielectric grease, but the old wires had their heat shields replaced with new ones. the truck has grown quite a bit, they got rid of some of the radio whining. The truck starts faster, accelerates faster and runs smoother, but all of this can be shared with 8 ACDelco Professional Iridium (41-110) spark plugs which I also have installed. Overall a great product!

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