I've read/been in a lot of those threads, it will work, AzMz3 thinks they are bad, but that doesn't mean they won't work. What about them won't work? They will modify the MAF signal that the ECU sees based on the data you give it. If done poorly, this can confuse the ECU and cause a CEL, but thats hardly "not working" (we're trying to alter the MAF signal here). You can either trust me on this one, or give me a more specific reason why it won't work so I can explain it to you, maybe I'm missing a thread here or something, but I've never seen anyone who has tried one on a Mazda3. I HAVE seen a lot of people shit talk them though. Perhaps in your "do a search post", you might at least suggest what to search for so that a noob would have a chance, but you know I'm not a noob. . .