Yes ... the muffler will stick out from the side and its ugly and messy. That's about the only reason. Go for side mount with a pitts style muffler or 135 degrees (aka 45 degrees down) so the muffler sticks out at the bottom in line with the fuse, its really clean that way. No real engine flooding problems ... I had a Black Horse SU31 and its the same as yours, mine was mounted 135 degrees.