I have another suggestion! Fairly important IMO, with long tails no one should use anything but the very soft/flexible exhaust hose. This is especially true with SM setups, their ring connection does not have the support of a typical four bolt connection. That was the reason I did not buy SM, being a mech for many years it just does not look substantial enough. Sorry to hurt a few feelings but I like things that do not give me any misgivings.
No matter what your beliefs are "GOD BLESS AMERICA"
Fully retired marine tech near 60 years in the biz.