I don't want to come off sounding like the other that tell ya to do a search, but someone posted this very same question like a month ago. Give it a try.
Few things you can do are simple.
1. Pull out the cone assembly from the fenderwell, lets more air flow and sounds much better. $Free
2. Get a K&N panel (oiled cotton) filter or AMSoil (Oiled Foam) filter. Foam filters suposedly filter better than cotton gauze and also allow more airflow, I love mine. $40-50
3. Clean out your intake. Up to 12 cans of berryman's are needed. (Mine needed 7) $2.50 a can at Walmart.
4. If you don't buy into the whole debate on not using synthetic oil in a SHO, changing to synthetic will free up a little HP (reduced friction) and give you a little better MPG. It also lubricates faster on startup which is never a bad thing. Extended drains with AMSoil are possible, 1 oil change every 25k to 30k is nice. Even Mobil 1 is safe for a 5k-7k drain if not longer. ~$30-$40
5. replace your sparkplugs if they are getting up there in miles. A full set is roughly under $40, but make sure you get the real ford ones.
6. Go to
www.shotimes.com and read up there