Perhaps the S58 will have similar issues. But at 50 to 100 hp more. Perhaps AA mid pipes can help.
Apropos, here is what AA says about the S55:
"The Active Autowerke F87 Mid Pipe was specifically designed to eliminate the highly restrictive nature of the S55 – thus creating optimal exhaust flow and drastically improving performance. In addressing the annoying sound ( described by many like that of a weed-eater ) we needed to better understand the issue..."
https://store.activeautowerke.com/pr...ition-mid-pipe