They are pretty rare.
Ed.200 had the standard system with the centre silencer removed, and quite frankly it sounds epic, without being noisy every day. Pops a little on cold too. The Akra does sound epic, but I couldn't justify the cost personally when comparing it to Ed's car.
Sadly he's sold it now so you wouldn't be able to hear it, but it honestly sounded great. And it really wasn't loud, Ed didn't even know the centre silencer had been taken out until a few months ago! Been along for a few long motorway trips in it too, and it was great, not droney either.