well...It will work. How long before the maf realizes its not the stock diamiter is unknown. the thing about the MAF is the diamiter of the box it sits in is remember and refrenced when mapping out te air. When you introduce it to smething not the same size then it panics and sends a cel. It's better to get an intake that is designed with the car and modify from there instead of working from scratch. In order to get that to work you would ned a maf customizer and i'm not shure if the CPE customizer is 3i,3s friendly yet.