[ScreaminRX8]

I was refering to the two "walls" as fikren was talking about and the cone is the tube that has a screen in it and when the box is closed it fits fluch against the filter, which has three screws holding it in. Once taken off it looks like a cone. I really can't tell that it is that much louder. The only reason I tried this is for better idling and better fuel mileage. It has definitly helped with the idling issue, but it has only improved my mileage by 1 or 2 miles to the gallon. I will personally re-install these items before I carry it back for my 30k service. Not sure yet if I am going to take them back out after.

Originally Posted by fikren

You can also remove one if not both of the screens in there also BUT there is some debate on if this is a good deal or not. The screens are there to straighten air flow to my understanding and are there by design from mazda. Some claim it helps but others claim that it has hurt idling.

I am not saying that they didn't put it there by design, some things are designed in because of regulations. If they have to do anything like we have to at Harley-Davidson to meet emission (EPA regulations), things like this are put there for that reason. Companys also have to meet noise regulations and this may be the case for the "walls" in the airbox. I am still learning about the rotary but I would think that it is like any other engine with fuel and air ratio's. On Harley engines you can introduce more air and it runs much better but if you add more air and open up the exhaust is when you need a new ECM flash. The main reason for the flash is the computer is trying to compensate for the extra air and less back pressure. They are so bogged down to meet all of these regulations for the different countries.