That design does not look very efficient and looks as though it caters to those looking for a quad exhuast look and nothing more.
It could be less restrictive than the standard sport exhuast, but at what price. Give me a break!
Waitlist: #4 M2 and #1 M2 CSL
2016 F15 X5 3.5xdrive (Current) - 2013 535i xdrive (Gone)
2008 E92 M3 (Gone) - 2006 E90 325i (Gone)
2002 E46 325xi (Gone) - 1991 E30 325i (Gone)