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It really depends on how your stock system is setup if you get any improvments or not. If your stock system does not allow good air flow then it can make a pretty noticable improvement.
The K&N made for lexus sc400's/300's actualy take away hp. The stock system is setup with a cold intake snorkel already so you can't really get much better than that without a blower.
But... its a ford. so I assume it would help.
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