Been running an airdam that was offered by JC Whitny on the front of my ' 78 Westy for three years now. Looks cool as hell. improved MPG by about 3-4 at speeds above 57mph. Brought my running temps down by 5-11deg. f at sustained speeds above 50mph., up to 73mph. Well worth the 99.00 paid for it. Jesse "...no one Ever expects the Spanish Inquisition..." M. Python