Welcome aboard! Holy crap...what road trip did you go on to put 3500km in 7 days? I hope you went through the proper break in procedure during the first 1K. That's more than what I drive in a car in an entire month. Post some pictures if you can.
Yoshimura, Akrapovic and Two Brothers are a few options for exhaust.
'17 Kawasaki Z650 ABS Stardust White
Long time car enthusiast, now a motorcycle enthusiast