Resonator Question....

marcielago · 11-09-2008, 03:30 PM

Hello Board..

Any ideas about what is the main purpose of the resonator in the e92's exhaust

What about the secondary cats

thanks in advance

The Shiekh · 11-10-2008, 12:15 AM

resonators are to minimize db and drone and cats are for co2 emissions

marcielago · 11-10-2008, 01:38 AM

Thanks for the reply sheikh...

Another question if u dont mind

Are the secondary cats as important as the primary ones?

BMRLVR · 11-10-2008, 10:32 AM

Quote:

Originally Posted by The Shiekh

resonators are to minimize db and drone and cats are for co2 emissions

Cats do not reduce CO2 emissions, on the contrary they actually produce it..... they break down toxic coupounds through chemical reaction. They process NOx, 2CO, and HC's into the less harmfull C02 and H2O and N2.

The Shiekh · 11-10-2008, 05:40 PM

Quote:

Originally Posted by BMRLVR

Cats do not reduce CO2 emissions, on the contrary they actually produce it..... they break down toxic coupounds through chemical reaction. They process NOx, 2CO, and HC's into the less harmfull C02 and H2O and N2.

Okay, I'll believe you. After finishing up my chem for pre dent I should have known that I guess lol, as far as I knew combustion produced h2o and CO2 which was then catalyzed. That N2 has to be at less then 1% though for sure..

Heat00 · 11-10-2008, 07:14 PM

secondary cats on my previous 335 got removed during aftermarket install and they were not hooked up the o2 sensors, not sure if it's the same on M3 but probaby so..

Monkeycheese101 · 11-10-2008, 07:27 PM

secondary cats are not hooked up to any sensors, I just removed mine.

Nate@IND · 11-10-2008, 08:22 PM

We removed the Secondary cats and rear resonators on our last project M3. Here is a video. It was very aggressive and would be too loud for daily driving but it did sound really cool

Secondary cats and resonators removed-

11-09-2008, 03:30 PM	#1
marcielago Private First Class 12 Rep 177 Posts Drives: SG F10 550i MSport, CB E39 M5 Join Date: Sep 2008 Location: Abu Dhabi iTrader: (0)	Resonator Question.... Hello Board.. Any ideas about what is the main purpose of the resonator in the e92's exhaust What about the secondary cats thanks in advance
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11-10-2008, 12:15 AM	#2
The Shiekh Second Lieutenant 16 Rep 267 Posts Drives: E92 M3 Join Date: Jul 2008 Location: Danville, CA iTrader: (1)	resonators are to minimize db and drone and cats are for co2 emissions __________________ -James aka The Shiekh 2008 E92 M3 6MT SSII/Silver Novillo/Sycamore BPU+ lol
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11-10-2008, 01:38 AM	#3
marcielago Private First Class 12 Rep 177 Posts Drives: SG F10 550i MSport, CB E39 M5 Join Date: Sep 2008 Location: Abu Dhabi iTrader: (0)	Thanks for the reply sheikh... Another question if u dont mind Are the secondary cats as important as the primary ones?
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11-10-2008, 07:14 PM	#6
Heat00 Major 51 Rep 1,027 Posts Drives: 2008 E90 M3 Join Date: Jan 2008 Location: Weston, Florida iTrader: (0)	secondary cats on my previous 335 got removed during aftermarket install and they were not hooked up the o2 sensors, not sure if it's the same on M3 but probaby so.. __________________ 08 - M3 Sparkling Graphite/blk leather/tech/6 speed 08 - 335i Sport/Prem/Auto White/Terra - AA Exhaust 07 Acura MDX Tech, 07 G35S /Nav
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11-10-2008, 07:27 PM	#7
Monkeycheese101 Private First Class 1 Rep 101 Posts Drives: 2008 m3 Join Date: Oct 2007 Location: bay area iTrader: (0)	secondary cats are not hooked up to any sensors, I just removed mine.
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11-10-2008, 08:22 PM	#8
Nate@IND BimmerPost Supporting Vendor 2866 Rep 11,374 Posts Drives: BMW Join Date: Oct 2006 Location: Chicago iTrader: (19)	We removed the Secondary cats and rear resonators on our last project M3. Here is a video. It was very aggressive and would be too loud for daily driving but it did sound really cool Secondary cats and resonators removed- __________________ IND DISTRIBUTION \| 866-963-4520 • FACEBOOK • INSTAGRAM • FLICKR
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