I have a Willard that seemed to smoke just fine but since the stinger was removable I pulled it. Now that I have it out I wouldn't go back. I appreciate the more open draw.
I also have a Savinelli with a stinger that's a good smoker. I can't remember off the top of my head, but this one might be permanently attached. If so I won't bother cutting it cause it doesn't seem to impede the draw as much; probably because it's shaped more like a large (maybe 10-8g) needle as opposed to the ball-end style.
Overall my take on stingers is the same as "system"-type wells & P-lips: I CAN get a good smoke with them & they SOMEWHAT do what their designed to do; which generally is provide a more care-free smoke. But I don't prefer them at all. More often than not they cause other annoyances and in the end, why bother? If you're really taking your time and enjoying the smoke, you often don't have the problems that these devices try to fix.
All that said, give it a few smokes. If you have similar pipes without stingers to compare to that would be great. Do some research & decide what you like before you cut on that old pipe.
Nick - Find me on Facebook facebook.com/nDoty & Google+ http://gplus.to/nrDoty