Hey Guys.
I passed the 1500 mile mark on my G37's ART pipes. Wanted to give an update. The Rattle I was complaining about earlier in this thread has completely GONE AWAY as promised by Tony.
There are no signs whatsoever anymore. Not during cold, warm, or HOT engine operation. I didn't have to drive the car abnormally to make the sound go away, and I think that may be why it took my rattle a little longer to disappear. I normally tend to stay off the throttle more than others.
Sound is much more dampened now. Wicked throaty when you're deep on the pedal, but muted when you want it to be.
So happy with my purchase. Thanks so much Tony for your patience in working with my issue. Can't wait for the rest of the Motordyne exhaust now!