Hi All
I have discovered that the only real way to get an audio track from the E70 4.8i that is similar to the E53 4.8is is to remove a couple of catalytic converters. I am now on my 4th exhaust and still not happy, so down to the removal issue.
However, this is illegal in Australia with massive fines for exhaust/workshops and owners if discovered.
Im curious if this law exists elsewhere in the world.

As a recap, I think Im resolved to a better than stock exhaust from my suppliers, but will hand the E70 4.8i to the wife, sell the 4.8is and I'll buy the new E70 4.8is/twinturbo/M/V10/whatever it will be when its announced. I already have my name down as top of list with BMW list when its announced.

Just a shame we couldnt get the audio track i was seeking, the E70 has 4, yes 4, catalytic converters.

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2008 E70 4.8i M Sport, Aero Package, Saphire Black on Black
215 21" wheels, Comfort Seats, Active Headrests, Sunroof, Premium Sound, Einsenmann Exhaust
Inbound: ACS Interior, Carbon Roundels and DVD System.

2005 E53 X5 4.8is (donated to wife)
2007 E90 323i M Sports Tourer (retired)
2006 E46 M3 Cabriolet (retired)
2001 E53 X5 4.4i Sports (retired)