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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| Best Aftermarket Cats for 1999 G320 ???
Hello,
One or both of my cats on my 1999 G320 (V6) are bad, as evidenced by the terrible clattering noise that comes from them at idle or low rpms. Very annoying.
So, I am looking for a solution which will work for my engine (possibly hi-flow), will still pass smog, wont cause a "check engine" light, and won't break the bank.
Is the best solution one of the Magnaflow universal fit cats, or maybe there is something different? If so, could you please tell me the part numbers and where you bought them from?
Thank you |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: Best Aftermarket Cats for 1999 G320 ???
Here are some of mine. They are very quiet. 
 (IMG_0354_DxOsm.jpg)
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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| RE: Best Aftermarket Cats for 1999 G320 ???
DUTCH - 10/8/2016 11:56 AM
Here are some of mine. They are very quiet. :bleh:
I see, you have three of them, but I need only two...  |
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Aircruiser
Extreme Veteran
Date registered: Aug 2011
Location: Atlanta GA
Vehicle(s): 2000 G500, 1986 300GD, 2017 Porsche Cayenne Hybrid
Posts: 364
| Re: Best Aftermarket Cats for 1999 G320 ???
If the heat shields come loose they rattle like a cat on nip. Are you sure it's your cats? I'm in the Times Square area intil Monday am if you need a second opinion.
Matt |
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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| Re: Best Aftermarket Cats for 1999 G320 ???
Aircruiser - 10/8/2016 9:53 PM
If the heat shields come loose they rattle like a cat on nip. Are you sure it's your cats? I'm in the Times Square area intil Monday am if you need a second opinion.
Matt
Checked the heat shields first - they are fine. It's for sure the catalytic (one or both). Thank you very much for offering your help to determine the problem, but I am out of town tomorrow, and have to work on Columbus Day (going to be a long day). |
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Aircruiser
Extreme Veteran
Date registered: Aug 2011
Location: Atlanta GA
Vehicle(s): 2000 G500, 1986 300GD, 2017 Porsche Cayenne Hybrid
Posts: 364
| Re: Best Aftermarket Cats for 1999 G320 ???
I have no experience with cat replacement on my G. However a quick search took me to the New York legal Walker 81652 and other similar replacements. It's a busy weekend with Expo East and the NM Treffen winding down, someone with first hand experience will surface soon.
Matt |
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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| Re: Best Aftermarket Cats for 1999 G320 ???
Aircruiser - 10/9/2016 12:38 PM
I have no experience with cat replacement on my G. However a quick search took me to the New York legal Walker 81652 and other similar replacements. It's a busy weekend with Expo East and the NM Treffen winding down, someone with first hand experience will surface soon.
Matt
Thank you so very much Aircruiser ! |
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ILIAN
Veteran
Date registered: Sep 2014
Location: Boston MA
Vehicle(s): 2000 G500 1999 CL500
Posts: 181
| Re: Best Aftermarket Cats for 1999 G320 ???
Don't forget, if you get the assembly from the dealer it will have a warranty of 10 years/80k miles if I'm right. You also need to check your engine to see if there is a rich running condition or misfire or something that would cause the cats to overheat and melt inside. If they did not melt then something must have caused the ceramic inside to crack and rattle. |
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DRT-DAN
Member
Date registered: Aug 2011
Location: Storrs Mansfield CT
Vehicle(s): 1994 G320 VIN# WDB46323117096453 and a 1982 300SD
Posts: 43
| Re: Best Aftermarket Cats for 1999 G320 ???
Hello, I have a 1994 G320 I have used http://www.timevalve.com/ Mike built me a whole new exhaust it is made out of stainless steel with a high flow catalytic converter. It works great and was relatively easy to install. I have the straight six-cylinder and he had all the jigs to make my exhaust I do not know if he has them to make your exhaust. Give him a call. |
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Otiswesty
Administrator
Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3004
| Re: Best Aftermarket Cats for 1999 G320 ???
Hi Dan, I have a 1995 G320 with the m104 I-6 3 liter motor, but mine is SWB. Did the Timevalve shop make new down pipes for you, or just the cat pipe and mufflers? I'll measure the length of my cat pipe as my mufflers are new from Germany, but the cats are old and original. Possible source of a rattle as well.
Also, do you have O2 sensors in your G320 cat pipe? My 1999 G500 has 2 O2 sensors before the two cats and 2 just after. The Eurospec G320 has none that I have seen. |
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kiato4
Veteran
Date registered: Aug 2013
Location: New York, NY
Vehicle(s): 1995 G320, 1985 190E 2.3-16
Posts: 161
| Re: Best Aftermarket Cats for 1999 G320 ???
I also have a Timevalve exhaust on my 1995 G320 LWB, everything including the front pipe, middle muffler, and main muffler. I have trusted their stuff for years, and if any issues their customer service is fantastic. |
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DRT-DAN
Member
Date registered: Aug 2011
Location: Storrs Mansfield CT
Vehicle(s): 1994 G320 VIN# WDB46323117096453 and a 1982 300SD
Posts: 43
| Re: Best Aftermarket Cats for 1999 G320 ???
No I was able to use my existing downpipe's. I have one O2 sensor just in front of my catalytic converter. |
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nadd
Expert
Date registered: Apr 2006
Location: UAE, Dubai
Vehicle(s): G500 2016 LHD, numerous Chevys
Posts: 1285
| RE: Best Aftermarket Cats for 1999 G320 ???
IBEX - 10/8/2016 4:20 PM
wont cause a "check engine" light
On this note, we recently had to change the catalytic convertors on the G55 (2009) at around 80,000kms, and put Fox (supposedly made in Germany) 300 cells (if I remember right) to replace the two on each side, as the new parts are north of USD6,000. That is one large unit per side to replace the original setup of two smaller ones for each bank. The check engine light came on soon after, and the shop in Dubai that did the work says all Mercs do this after they replace the cats, but there was a setting in Star that I managed to change to turn the light off.
And yes I changed out all 4 lambda sensors for new OEM Bosch parts after renewing the cat. |
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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| Re: Best Aftermarket Cats for 1999 G320 ???
Please check this out. They located in Florida, USA. And they are selling Aftermarket Catalytic Converters specifically for MB G 320. Is it something that worth to try?
http://www.magnumtuning.com/en/detail/performance-catalytic-convert...
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| Re: Best Aftermarket Cats for 1999 G320 ???
That sure looks like a Magnaflow cat 99005HM at a lot less of a price.
I had installed something similar on my former 280GE. No issues. Shop around.
Also, take a look under the hood for a label with labels "Engine family" "EVAP Family" Displacement" "emission Control System".
Snap a picture of it and post it here.
Edited by J.R. 10/15/2016 4:34 PM
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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| Re: Best Aftermarket Cats for 1999 G320 ???
J.R. - 10/15/2016 3:41 PM
That sure looks like a Magnaflow cat 99005HM at a lot less of a price.
I had installed something similar on my former 280GE. No issues. Shop around.
Also, take a look under the hood for a label with labels "Engine family" "EVAP Family" Displacement" "emission Control System".
Snap a picture of it and post it here.
Thank you for the info... I checked under the hood for the label(s), and there is nothing about "Engine family" "EVAP Family" Displacement" "emission Control System". That is why I am confused and don't really know how to chose a correct Catalytic Converter for my car. There are so many companies and so many seemingly suitable ones, but I don't want to get it welded to my exhaust and discover that it triggers the Check Engine Light... |
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| Re: Best Aftermarket Cats for 1999 G320 ???
Give the cat you have a good look over. There should be a plate on the cat with some info. It is a TWC cat...three way cat more likely as I think that is all in use for late models, just need to see if the cat has an air injection pipe.
Edited by J.R. 10/17/2016 10:07 PM
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| RE: Best Aftermarket Cats for 1999 G320 ???
Some more info:
http://support.magnaflow.com/02catalytic_converters/04basics/04emis...
http://support.magnaflow.com/02catalytic_converters/04basics/04epa....
http://www.magnaflow.com/support/tech-bulletins/
http://www.dec.ny.gov/chemical/90781.html
http://www.dec.ny.gov/chemical/87411.html
Not sure if your vehicle is exempt from New York emissions inspections. Just be informed before you buy a solution
Edited by J.R. 10/18/2016 7:57 PM
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IBEX
Member
Date registered: Jan 2015
Location: Gulf Shores AL
Vehicle(s): 1999 MB G320, 1999 MB E300TD
Posts: 43
| RE: Best Aftermarket Cats for 1999 G320 ???
Thank you so very much for the info. ... I checked the MagnaFlow website and found their Catalytic Converters for the 1999 Mercedes E320, it has the same engine as my truck (M112, 3.2, V6). It is Compliant for use in California and NYS. So I am wondering if it (2 of them) could be be installed on my truck and if it will trigger the Check Engine Light after the installation? The MagnaFlow Catalytic part # is 444104...
Edited by IBEX 10/19/2016 9:45 AM
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| RE: Best Aftermarket Cats for 1999 G320 ???
Truck cat systems require more cat capacity than car.
It sounds like you have the two elongated cats that are mated next to each other with one engine exhaust pipe pipes entering each cat and after the cats they flow into a single pipe. Correct?
If so, you may want to build the system with the two cats in parallel but probably offset so as to fir them in the space. A reputable exhaust shop can guide you through this.
Will the O2 sensors upstream from the cats remain in place?
Will the install try to match fit the end of the engine pipes to your custom catalytic system?
Will the install try to match fir the end of the custom catalytic system to the remainder of the exhaust?
How many O2 sensors are there AFTER the cat?
Then we'll talk about triggering a Check Engine light.
Edited by J.R. 10/19/2016 7:30 PM
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