I'm mounting a fox 46abc. ALthough fox mufflers are very loud they can be had in a tilt up or a tilt down version. New engine will come with a tilt down but fox will trade it for a grand total of $3. Then you have a tilt up. The tilt up muffler on a side mount gets it away from the fire wall and allows muffler to clear. It is one of Foxes better ideas in that regard. The tilt down muffler on an upright motor drains excess fuel away from a flooded engine. Most other muffler mounts on an upright would hold excess fuel that I've seen. Foxes are quirky but this time it works well.