go to lowe's home depot, orchard...any of those hardware stores and make it yourself man. save mad money.i have enclosed 2 links for ya! here is an additional site for more info ;) http://www.mtco.com/~westcj/Brian/k&n.htm I am getting a new air intake for my 97 318is.... but I was wondering if a heat shield will make a difference? I know the dinan one, and most others come without a heat shield, yet a couple systems come with a fully enclosed heat shield.... does this help at all? and will it even make a difference??