Chuck it is doc's intake & it is a weapon r it doesn't come with k&n filter. but I'm sure k&n will fit in to the stock box, at lest the front part.
Yes, a K&N cone filter will fit in the front part of the stock airbox on my 45 but I do not know for sure if it will also fit on a 35. But I know in the past other 35 members have used a smaller k&n reverse cone filter to fit into the stock airbox.