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#1
10-24-2008, 10:26 AM
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OEM Cat's VS Aftermarket
Does anybody have any input on purchasing IE Magnaflow vs OEM?
More airflow/HP would be great, but I still want to maintain a quiet sounding car. Anybody experience different cats? (includes the 2 precats).
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k 
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#2
10-24-2008, 12:15 PM
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Quote:
They don't use the typical brick catalyst like the OEM. Very small, 4" diameter and about 10" long. Picked up 11HP on a load dyno over a single SL500 OEM converter. Inexpensive, about $110.00. Changing the cat will not effect your exhaust sound.
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http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg 1971 280SL ROADSTER 1988 300CE TWIN TURBO WIDEBODY 1994 E320 CABRIOLET 1999 C43 AMG 2005 G55K AMG 2008 CLK63 AMG BLACK SERIES
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#3
10-24-2008, 12:42 PM
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Quote:
 Everything I wanted to hear.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#4
10-25-2008, 03:41 AM
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I got it replaced today, but I am a little concerned with the sounds....I hear a distinct "tin clanking type" of noise.
Should this be normal? He basically drilled through the two precats and threw out the insides and put in a magnaflow cat in place of the old one for the main one. He said this was my best option. He showed me the insides of the precats afterwards and they were just completely trashed.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#5
10-25-2008, 08:55 AM
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Quote:
"Clinking" typically is a noise you get when a catalyst brick rattles in the converter. The spun metals never give this type of noise due to how they are constructed. Not sure what you mean by "drilling" through the precats? Did he like "rota-rooter" them ??? Possibly something left in the precat-exhaust pipe ???
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http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg 1971 280SL ROADSTER 1988 300CE TWIN TURBO WIDEBODY 1994 E320 CABRIOLET 1999 C43 AMG 2005 G55K AMG 2008 CLK63 AMG BLACK SERIES
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#6
10-25-2008, 11:19 AM
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Yes it sounds like debris. I'm not sure what model he installed. They are closed today otherwise I'd call and find out.
He left the precat shells in place -- but instead of putting new precats in, he simply cut through them so its straight through at the front. I essentially have one cat now. Maybe I should give it a good long Italian tune up on the freeway first to see if I can blow out (possibly) anything left over in there.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#7
10-25-2008, 01:30 PM
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Hehe, just make sure no one is behind you when you blow that metal out.
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2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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#9
10-25-2008, 01:41 PM
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any clanking sound isn't right..I'd bring it back in...
Jonathan
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#10
10-25-2008, 02:25 PM
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Loud clanking or alot of little things....
There could still be precats falling apart and making their way into the cat.
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-Justin 91 560 SEC AMG - other dogs dd 01 Honda S2000 - dogs dd 07 MB ML320 CDI - dd 16 Lexus IS250 - wifes dd it's automatic.
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#11
10-25-2008, 04:26 PM
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Well we are doing the oil pan gasket and we found a bracket that was loose half way down. Once we are done we will tighten it back up and hopefully the sound is resolved.
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#12
10-25-2008, 10:28 PM
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Got it! Required to take off a coolant hose at the front, but after that we could jack it up high enough. Fiddly though? Yes.
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#13
10-25-2008, 11:22 PM
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well you know that the precats have platinum in them and while drilling them pretty much deletes them the guy who did then has a nice amount of platinum now. Oh and another thing, if there are still pieces of the precat in there it can damage the engine alot. When the exhaust stroke scavenges the cylinder it can suck some of the cat up in the cylinder.
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