On anything larger than an 8 inch prop a K&B Sportster 20 with a muffler will run away from an unmuffled Veco 19 by quite a bit. We had someone at our field once with an unmuffled Veco 19. You really don't want to hear that engine at anything less than 50 yards unless you have some good ear protection. The Sportster with its long muffler is a completely different story.
Jim