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#1
01-16-2009, 04:57 AM
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Catalytic Converters - illegal to remove where you are - update on exhaust
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) 
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#2
01-16-2009, 08:29 AM
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for some vehicles you can get aftermarket cats that are designed to sound nicer than factory in conjunction with a matched aftermarket exhaust. taipanxp is one company here in aus that do it - http://www.taipanxp.com.au/
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#3
01-16-2009, 09:40 AM
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There are only one set of cats on US cars, mounted on the headers. We do have a pair of resonators after the headers before the muffler, but no secondary cats.
I know it was a mod on the e53 to remove the larger center resonator, and I was considering replacing mine with a couple of bullet resonators. Just not sure what the end result will be.
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#4
01-16-2009, 10:39 AM
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i am in the same boat.. want better sound out of the exhaust, but i do not want to purchase a $2500 exhaust system...
so the best bet, remove SOMETHING... not sure what just yet... anyone have any pics of the bottom of 4.8i?
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Christiaan.... 2008 4.8i 
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#5
01-16-2009, 10:47 PM
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Quote:
i do find this thread kinda funny however. i have modded my pickups for years to be loud and proud. oddly enough i don't think i want that anymore in my DD. i have plenty of other stuff i can mod i guess. not to mention the noise gets old after awhile.
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