The racks just touched my Wings mufflers, I ended up installing spacers between the rear mounting bolts and the frame (by the pegs)
to get the racks to splay out a little, giving about 3/8 inch clearance.
2013 Ktm 250xc, 2012 Ktm 300xc
2011 Ktm 990 Adventure Dakar
2011 Ktm 450 Six Days
2008 Ktm 690 Enduro
2005 Bmw R1200gs, 2013 Sherco Trials 2.9