I think mine is 17 or 18? I love it, just loud enough to sound like it's not neutered but not obnoxious. I got the oval one for $269, I think my brother paid $329 for his tri-oval one, which is admittedly way cooler looking. Both are carbon fiber.
I put the bike away last year and when it came, it had both the slipon and the SISF flash and the combination of the 2 make it feel like a whole new bike. I also debadged it recently, I like that also. My 2012 has 36k on it and it looks like new.