That 14" one will drive you nuts on the road. I'd stick with what ya got. How long has the system been on the truck? Mine got a bit louder after I got some miles on it.
I've seen a lot of cutouts put on vehicles. Yes, there is a difference in quality and cheap cutouts leak. I don't recommend them as they all will leak eventually, even the more expensive ones. And you don't wanna run with cutouts open all the time. Talk about noisy!!!!