As said they dont work. They will but they wont. The filters are generally butt cheap, the craftsmanship is mediocre at best and worst of all, the mounting hardware is absolute crap. If the CAI shakes around, goodbye MAF as said earlier. Hotshot and AEM have done quite a lot of research on the placement and mounting design. There is a reason these units cost more. The Hotshot is T304 stainless and they do excellent welds. My Hotshot has held up well. I have seen Hotshots that are quite a few years old and they have held up well also. You get what you pay for, and exceptions to that are scarce. If you are on a budget, get a Place Racing CAI; they went under and there is a huge group buy on them.