Will a 318 left side cover fit on a 332/330? I know the 318 has the vent holes in it but will it actually fit? There seems to be a few covers with heavy duty air filters floating around and my brother is interested in one but doesn't want to put holes in the 330 cover since they are harder to find. Also does anyone know anything about the heavy duty air filters on that I have seen a couple of. They mount on the outside of the side cover and have an air stack drawing the air into the filter before being routed into the engine area.