I've had my 2007 328i coupe for about 7 months now and would really like to start making some mods. Right now, I am looking to add an air intake. I have researched a few brands, but just can't decide which one I want. I was hoping some of you who may have one of the brands I've researched could help me out. I am between the aFe stage 2, Injen, BMW Performance, and Dinan. Any advice out there?