Hey there. I registered just to answer your question. Torque Monster Headers is the way you should go. I have them on mine and they are an amazing piece of work.

TorqueMonsterHeaders.com

If you are looking for more information related to Ford Explorers and Mercury Mountaineers, visit ExplorerX (www.explorerx.com). Join up on the forums (it will save you some money on headers also). It is a great site. My username is the same over there.

Yes, it is true ford racing makes/made a header for the explorer. It wasn't much better than stock though.