370Z Exhaust Sound Clip data base
that would be the section you want to look for sound clips, you can also check to for sale section for people selling, some include sound clips with their sale thread. Check to see what theyre coupled with, my MXP clip in my thread has Motordyne ART Pipes with it. Sounds sick
As far as recommending an exhaust for sound, Fast Intentions got a nice deep sound, MXP slightly higher but deep tone, Powerhouse amuse has a sweet tone, Invidia is great and more on the cheaper side too, all these are Cat backs so you'll get better performance as well as nice sound from all these