I bought my S7 last year and was told that it had a Cherry Bomb on it. I have to say, it's bloody noisy! Great for attracting attention, but I have a habit of setting off car alarms! Also, it's really annoying on long runs. My missus keeps asking me not to rev the car on the driveway so as not to annoy the neighbours!!
I'm looking at putting a quieter silencer on as it's just too much! My advice, listen to everyone else, don't bother with it :-)