Thanks very much DannyBoy, Coldel and glrnet, including the kind offers Also it's interesting to hear that the popping reduced or disappeared after settling in. It doesn't sound like it's an issue.
It's just that in previous lives I've had 2 cars with Crossflows, 2 twin choke Webers, competition exhausts and all that. When you back of of one of those combos it's like the 1812 Overture with the accompanying fireworks. So in a way I've been there and done that - I'm obviously getting older!
So I guess I'm after a compromise that suits the 350z - a bit more noise - but a sophisticated one! Everything I have read so far suggests that this may well be the combo for me.
I think the answer is definitely to hear one in the flesh. Unfortunately, due to a recent family bereavement and me being an executor I have my hands a bit tied at present but hope to be able to take up one of your offers in the not too distant future.