for a nice and not chavvy noise I would recommend the exhausts I have mentioned. To be 100% track safe they are the best bets, I did a lot of research into every system before buying mine and my setup and I have had no issues ever on track and no need for a bung.
I run the DC Sports race mani, AEM long arm induction in the wheel arch (where it has an air feed from the bumper) and the Fuji RM01A, statis tests at 6500rpm have been well below all the limits as have the drive by numbers.
It's got no drone whatsoever throughout the rev range and sounds lovely on full chat.
Pop down mate and have a go in it sometime as I don't think I am too far