Originally Posted by Yoro35i
that thing that looks like an X thing is the central silencer??
did you change the whole system and running no cats??
Its a google image.
I have an E90 so mine is slightly different - I have Catless DPs and stock from there onwards.
My assumption is that the X thing is to mix the exhaust gases in the mid pipes, its not big enough to be a muffler. The link between the two rear boxes does the same and apparently helps to reduce drone.
I would add a pair of resonators to the catless mid pipes smoked is selling and away you go!