I got into an argument on this board at some point with some fool who claimed a pipe is a pipe and thats all there is to it. Well, I got news for ya, talk to any mechanical engineer anywhere and they will all tell you that the shape and size of the pipe has a LOT to do with the way air flows through the system. So its up to you to decide if the extra 100 bucks is worth it. You are basically paying for engineering. I bought an AEM and im very happy with it. . .