Eventhough the sound for the Scorpion is very nice i am worried about not being street legal in some countries.
I will go for the Ixil hyperlow, sound is also very nice and low
The Scorpion comes with 2 user-removeable baffles and with both fitted, isn't all that loud at all - certainly nowhere near the point that it would attract police attention.
I see this is an old-ish thread but had revived as I can now offer a personal opinion on both exhausts mentioned by the OP, having had both fitted to my machine.
Although I'm sticking with my Black SC Project Conic (as specifically want an all Black aesthetic and Scorpion wouldn't oblige in customising one of theirs), I believe that the Scorpion is the better sounding and nicer looking part (for the XSR700).
The SC Project silencer/muffler really needs to be a 'fatter' - As it is, it's a bit on the skinny side, for this bike.
As for the sound, the SC Project does come across as I had heard in several youtube clips, where it's a bit more dirt-bike sounding and agressive compared to the deeper, mellower (relatively) Scorpion.
The Scorpion is generally more 'meaty' and, with the end baffle removed, much more bassy, while being about as loud.
This was rather confirmed when I drove past a mechanic friend's garage this afternoon. As he was tinkering with a scooter outside, I stopped to let him see the latest mods and new exhaust (he had previously checked out the Scorpion I had fitted.)
First thing he said after I pulled up: "Have you changed the exhaust? The old one sounded better".
D'oh!
HTH