Instructions are clear and illustrated. Only a few steps remain for the installer to understand. It looks great, growls a bit and took about an hour to install as I had to remove the driver's side wheel and fender skirt. No special tools are required, but it does take some dexterity to get to some of the factory screws that need to be removed. I haven't calculated the MPG increase yet, but I also installed a cat rear exhaust to complement the cold airflow increase. Installed on Ford Fusion S 2011
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