I have a 94 bird with the 4.6 and most everything on the car is original other than a few things ive replaced. Ive had the car for 5 years and it had 105000 on it when I bought it. It has about 150k on it now. The car runs great and ive replaced plugs and wires but never the coil packs. They look original to the car like a lot of other things I've replaced just didnt know if id gain anything replacing them.