I know it’s an old thread, but the OP was asking about the slip-ons, which give insignificant, if any at all, weight savings.
I bought a 2018 Supersport S last week, my first Ducati in 10 years, and it had the Akro slip-ons installed. I’d looked at a few Supersports and to my ear, the Akrapovics didn’t sound much different to stock.
So my son and I threw together this quick, ‘interesting’ comparison between Akrapovic, stock and… nothing. (video was made after I’d removed the exhaust servo…)