RPi currently offers a full catback system. The exhaust system is catless from the downpipes back. RPi will soon be coming out with their GT downpipes for the F10 M5 and the F12/F13 M6 which will delete the cats in the downpipes themselves. Check out the link below for more information!
http://f10.m5post.com/forums/showthread.php?t=757499