Unfortunately you will never get that sound, the G35 was the best sounding car Infiniti produced, the G37 was just as good but at the end of the day those are NA motors compared to forced induction 3.0s. I strongly recommend going with CBE over the axle back, I did that my first Q50 and just wanted more so I had to piece together a full exhaust kit, I was also under the impression that I would not mod my car, that did not last long. Regardless of what you decide, there are a ton of clips on youtube for you to view, the most popular choices are Fast Intentions(90% of the members will recommend) , ARK (I strongly recommend, as will others), Stillen, MBRP (Strongly recommend not getting this set due to the drone), Invidia, and quite a few more but cant think of them off the top of my head. Infiniti has an axle back and thats what I started with, I wanted more right away lol Good Luck in your hunt!