Hey John, another option would be the C240/C320 M/B cover. Direct plug & play and affords 50% better air volume/flow. Can be found on Ebay and salvage yards for under $100.
http://www.ebay.com/itm/2003-C320-ENGINE-COVER-819-/171568465586?hash=item27f24706b2&vxp=mtr
Here's a pic of my '05 Limited...