The jury is still out on this one, and you'll get a bunch of opinions. I do not use soft mounts for two reasons, 1) Bisson will not warranty their mufflers if used with a soft mount, so I figure they must know something I don't, 2) If your gas engine weighs 5 pounds, at 10 G's the mount will need to be stiff enough to support 50 pounds without too much distortion, I figure with rubber that stiff it won't help too much with small vibrations. Now watch how bad I get flamed on this one!