[SpudRider]

Originally Posted by jimjr21

Without seeing the inside of the muffler it is hard to determine the restriction that it has. The outside shape looks like it would have a single bypass design.

Airbox is a nice large. The opening may be adequate. Will have to put it on the flow bench and test it. Design also looks good to remove water from intake.

I am not a fan of the foam type filters. Too easy to choke the air flow with excess oil.
How thick is the filter? Can find a standard K&N to drop in there if there is enough space.

Yes, I need to receive the RX3 before I can inspect the muffler. If the stock muffler is very restricted, I might consider purchasing an aftermarket muffler. However, the design of the stock muffler looks promising to me.

I apply the minimum amount of filter oil, and I get good results from foam air filters. I don't trust K&N air filters for off road riding. Since it is easier to apply sparingly, I use No-Toil oil on the conical air filters in my Honda CRF250X and Honda XR650L. It does a very good job filtering dust and allows excellent air flow, which is superior to that allowed by conventional filter oils. However, I still prefer using BelRay filter oil for flat foam filters, since it is much easier to squeeze the flat foam and remove the excess oil. Therefore, I prefer BelRay oil for the flat foam filters employed by my Zongshen ZS200GY-2, and the Zongshen RX3.

Judging from the photograph, it appears the RX3 air filter is about 1/2-inch thick.