Nolly's spot-on here. The C-Pig is similar in output to the 81, but just a better pickup in general (more interesting/colorful, better mid-gain/clean sounds). I have a Warpig neck as well; it's smooth, round and bassy. It'll punch you in the gut hard. I'm not 100% sold on it (thinking about switching to a Cold Sweat), but it is a great neck pickup if you like the kind of weight it pulls.