It looks like a heater of some sort, but I can't imagine thats what it actually is. Here is a link (the 19th photo): http://www.
carmax.com/enUS/view-car/default.html?A Vi=544&id=6200916&N=191+674&Ne=662&D =60&zip=77303&sP=NA-14000&sY=2002-2010&pD=0&pI=0&p T=400&pC=200&pB=0&No=540&Ep=search :findcar:home&Rp=R&PP=20&sV=List&Us=14&CD=240+398+ 15+9&Q=5b5e8712-ca8f-47d7-8f81-27a6c642800a