Search the Gotts mod on this forum. The air intake runs through the side of the fender. The OEM intake is small there, restricting air flow. The Gotts mod is to remove that section of intake piping and replace it with a short section of 3" PVC. This greatly increases the air flow into the engine and gives a slight boost in performance. Cost about $15. Everyone who has done this mod says it helps.
Just remember to remove the negative battery terminal for awhile. This allows the computer to reset and adjusts itself for the greater air intake.
Sort of a poor mans CAI. And works just as well.