I have a set of both shearer and CPI's that I trade around on my blue banshee. Yes, I am aware of the clearance issues. That's something that you should check with every single pipe you put on a banshee, check frame clearances and all that every time I bolt anything up. That's a given.
I used to have some unstamped ones and paid a shit-ton for them. I'd actually recommend against them any more, since their main pipe mounts are inferior and will ALWAYS crack unless you get new mounts welded on, but that will ruin your chrome. My old unstamped ones had a triple plate white show-chrome so I didn't want to mess with welding new mounts on. I sold those a long time ago. You can still get them, but they will be used! Ha Ha Ha!