Crank case breather?
 

I followed some tips from older threads about getting a smooth elbow installed on my gp gxp. Thing is do i have to drill a hole in my intake elbow for a gromet or can i use a crank case breather filter instead? I have couple K&N lying around cause i just finished helping my bro with his 70's grabber 302 swap. Figure just pop it on and be done with it.?