Got cha, cheers .
No drone but then again I've only really ever had quality exhaust systems, so I don't really know what you'd class as drone ??
Also worth adding that the sound changes as the system cokes up, the sound it has now is a lot different to how it was when it was first installed, the same sort of sound, just more pronounced and has a wider range - better really, lol.
Cold start up its deep and loud but then by the time it reaches temp it settles into a deep, burble.
The system is true duel system, so you can hear the separate cylinders blatantly, which is great, as come on, the engine in this car is a good one.
At motorway speeds it's noticeable but no way intrusive at all so long distances are no issue at all.
The syncro-rev gear box on the 370Z is bliss with this and you'll purposely be going into roundabouts hot just to hear it bark and spit on the run down.
When it's hot, it snarls and barks, on track it got real hot and I was approached a few times by other drivers after a session to say how good it sounds.
You will also have your window wound down all the time juts to hear it.
Clearance is no problem at all, I'm running OEM chassis and wheels and to get into my car park at home I have to go over two large speed bumps and never once, have I ever heard any sort of clipping or scraping.
I procrastinated a long time about my system and used the criteria of sound-looks-performance as measuring sticks to what I wanted.
The ARK came out top for me on sound and looks, so I went for it.
The time and thought that went into it was really worth it.
Hope this helps a bit, I may have written something else about it in my thread that I've not put in here, so if you want more have a look here....
http://www.350z-uk.com/topic/71638-suits-le-mans-blue-370z-small-ark-grip-video-150214/