I did have the Akrapovic system and to be fair it's a nice exhaust, but it isn't exactly light at 6.2Kg (stock is 7.5Kg) and it still contains catalysts. As Tom implies, it's too quiet with baffles in, and too noisy with them out (but does sound good).
I now have
this. At a tad under 1.5Kg (including the link pipe and fittings), it's as light as a feather. With the baffles in, it sounds about right IMO - a full and throaty tone, but nothing that will pi55 anyone off or attract unwanted attention.