i believe those are 2" or 2 1/2" materials, go to your hardware store and get a rubber fernco , thats the adapter peice and then get a peice of pvc pipe about 6" long( for the blue peice in my pics)also 2" or 2 1/2 just measure
i dremeled my stock one out havent rode on it yet but looks sexy!! if you dont ride in slush or water alot then just do a clamp on filter w/ an outerwear cover. cheap/ easy est way