OK, just shot some video. Its dark but you can hear the exhaust and thats the point here. Seems you have to rev it pretty good to get any noise. Nothing until at least 3,500 rpm.

YouTube - BMW 2002 4.6 x pipe resonator delete

Are stock 4.6 mufflers really restrictive? My guess is that they are.

Also I weighed the resonator and as I recall it was like 18lbs.

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2002 X5 4.6 Sold
Dinan CAI, TB, Mass Air, Stage 4 engine & tranny software, X-pipe
2004 745Li
1997 Ford Mustang Cobra Vert
1985 Mazda RX-7
13B-REW single turbo 60-1, Haltech, Meth injection, MSD Ignition, and much more
2008 Mazda Speed3 Hypertech Tune