I found this schematic of the SKRR exhaust, and the blurb below. Boy is this thing screaming for a full Akra!
"Exiting spent gasses is a uniquely-designed 4-2-1 exhaust system,
featuring a host of race technology mixed in with the emissions requirements designed to meet government regulations while still providing as much usable power as possible. It uses a short rear end muffler, pre-silencer and electronically controlled interference pipe flaps, as well as a fully controlled exhaust gas manifold and two fully controlled three-way catalytic converters"
found it here:
http://www.motorcycle-usa.com/617/3678/Motorcycle-Article/BMW-S1000RR-Breaks-Cover-in-America.aspx