Nobody replied and this thread is old and dead so why not..
Don't do it. It only makes your intake louder. You will most likely throw a CEL light because the MAF will get dirty or covered in oil. The OEM box is a Cold Air Intake. The feed tube pulls from the bottom of the bumper. Aftermarket CAI will just pull hot air from the engine bay into the intake. Cooler air is better for your engine. Unless you have a big engine that sucks a lot of air you just will not be able to benefit from this.