I have the Tomei UEL catless headers, Tomei overpipe, Invidia catless front pipe, and the same Perrin cat back as you. It sounds great but is very loud... Especially the cold starts. I don't think it's to loud though, and it doesn't drone too bad on the highway. With a tune, it got rid of the torque dip in low RPM's as well
[ame="https://www.youtube.com/watch?v=QNF7TwieaeU"]https://www.youtube.com/watch?v=QNF7TwieaeU[/ame]