I installed them on my 2005 Ford Escape XLS 2.3 4 cylinder. I paired these spark plugs with a heavy duty replacement K&N 33-2187 air filter. While I didn't notice a noticeable increase in fuel economy per gallon, the ride was a little smoother and the engine was a little more powerful and a little more responsive. I personally recommend them. Make sure they are compatible with your specific vehicle!
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