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2003 upgrades
What are some upgrades that I can do to my 2003 Expedition to get more power and fuel milage out of it. I have the 5.4L in it with just a little over 14,000 miles on it. I use it as a daily driver and pull our 27' travel trailer camping. I was thinking of putting the K&N filter system on it, but not sure. When I bought it, I was told it was set up for towing, but do I need to put a transmission cooler or anything like that on it? Will these upgrades void out the factory warrenty? Any and all personal experiences would be appreciated.
Thanks
Rob
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