There is a video of the indivia CBE on youtube and its pretty deep but IDK what the other mods are. Test pipes will net you more overall power but will be loud and with some CBE raspy...HFC's will net you some gain but will keep quality sound on most CBE. Go to the search at the top of your page next to "quick links" and "new posts" Exhaust notes and styles are a personal preference so my advise would be to take your time and choose wisely. Also use youtube.com its a great exhaust data base. here is a link to the exhaust data base that is in the forum but still go on youtube:
370Z Exhaust Sound Clip data base
here is a thread someone just started on the indivia with ART pipes:
Invidia Exhaust and Motordyne ART pipes
Another thing of advise is take your time at anything you are looking into and
do all the research that you can. Slowly but surely you will come to a decision.
I hope this helps...and dont let the price keep you away from getting what you want...you can always save