Yoshimura R&D just announced the Alpha slipon exhaust for the Kawasaki H2SX. Availability is still unknown, but expect it to be widely available in the next 1-2 months as they ramp up production and fill the distribution chain.
There will be two versions, a full carbon fiber version, and a stainless steel version with a carbon fiber end cap. The tradeoffs are a slight weight and priced difference. Otherwise they are the same slipon. You can expect to shave off about ~8 pounds (3.6 kg) by switching from the stock exhaust (13.0 lbs) to the Yoshimura Alpha.
Details on their website: