I would like to hear that Nismo exhaust. I was put off from reports from the States where it is was suggested it was too quiet. Having had one on the 350 it was just right for me and build quality was supurb - yes I would say the finish was superior to the Stillen, just.
I got the Stillen last December for about £1200 all in, including shipping/taxes. One of their regular sales
Traders here are really missing a trick with a distinct absence of aftermarket exhausts on offer for the 370 - the one thing the car really cries out for.