I just went out s looked into the tail end of my Stage 2 pipes and there is a baffle in there.
The OEM exhaust has 3 baffles, I have removed the first and last baffle but kept the larger center baffle in place which has 8 holes in it. After this seasons driving I might consider removing the center baffle.
Bruce 1964 4/4 Series V Comp (Megan) 1994 +8 (Maurice) tis no more 2013 M3W (Olga)