i am thinking of buying one and wanted some feedback on performance and sound, thanx

 

I have an Sp2 on my 2004 G35. Performance and sound is great, but if you really want to hear and feel the difference you will need to add a y-pipe and down pipes.

This is what I have:
down pipes
y-pipe
3 inch B pipe
Greddy SP2

Go to http://www.vrsexhaust.com/VRS_PICS/vrs_pics.html
and scroll down to the 350z set up.