I agree with many here that Suspension upgrades is the best money spent on these bikes!
Traxxion AK-20 and Hyperpro 3 Way rear shock transformed my bike into an off road T-Rex.
Nothing else comes close to high performance suspension work.
2013 Ducati Hypermotard SP, 2011 Husaberg FE570S, 2011 BMW S1000RR, 2010 BMW F800GS
2007 Husqvarna TE610 , 2003 KTM 525 MXC