I had it on my G37 before I got rid of it. It was a good exhaust provided you add the elements you need to make it all work. I had Takeda long tubes, Motordyne M370 intake manifold ( Yes it made a difference in sound.) with a Motordyne XYZ (I had the resonator and the straight tube pieces) with FI RHFC's. Here's a soundclip of it without the resonator on the XYZ Y-pipe. There are more on my Youtube Channel in various stages of setup ( i.e. without the motordyne M370, with the resonator, before the XYZ and without the FI RHFC's. The video is the final setup.
https://www.youtube.com/watch?v=W9n7KVIYbWk