Here's a couple of clips of mine. They're not the best as they're taken using an iPad, but may give you an idea of the differences.
Standard
https://vimeo.com/185364863
Fast intentions true dual catback
https://vimeo.com/185365110
Fast intentions with berks hfc's
https://vimeo.com/185365331
I would say it's an amazing sounding exhaust, with excellent build quality. There is a bit of drone between 2-3k rpm which could become tiresome if used daily for longer runs. I only added the hfc's as I got a good deal on them. The exhaust sounds considerably deeper (meaner) with them but obviously the drone is increased a bit, plus there is the hiss when the revs drop off (changing gear etc) which I'm not keen on.
Sent from my iPad using Tapatalk