I've found three full system exhaust kits on RevZilla.com for the Kawasaki Z650 https://www.revzilla.com/parts/2017-kawasaki-z650#v2-facets%5B%5D=945&page=1&page_size=96&sort=featured&tab=all&implicit_facets%5B%5D=227&implicit_facets%5B%5D=1889
Akrapovic Racing Exhaust System
$845.05 full titanium
$971.05 titanium/carbon fiber
Two Brothers S1R Exhaust System
$719.98 carbon fiber
Two Brothers S1R Black Series Exhaust System
$629.98 aluminum
$746.98 carbon fiber
Akrapovic Racing Exhaust System
$845.05 full titanium
$971.05 titanium/carbon fiber
Two Brothers S1R Exhaust System
$719.98 carbon fiber
Two Brothers S1R Black Series Exhaust System
$629.98 aluminum
$746.98 carbon fiber