SL55/63/65/R230 AMG: V12 secondary cats??
04-14-2012, 12:32 AM
#1
Super Member
Thread Starter
Join Date: Nov 2005
Location: Cold Snowy North
Posts: 780
Likes: 0
Received 0 Likes
on
0 Posts
-
V12 secondary cats??
I can't figure out where the secondary cats are on the V12s. (Do they even exist?)
When I was under my 600, I couldn't see them.
I searched and found this image of the SL65 exhaust...again I can't see where they are located, unless what I keep thinking is the actual cat is actually the secondary cat...however, I could swear there is an O2 sensor on it.
-Tail pipe side-
-Engine side-
When I was under my 600, I couldn't see them.
I searched and found this image of the SL65 exhaust...again I can't see where they are located, unless what I keep thinking is the actual cat is actually the secondary cat...however, I could swear there is an O2 sensor on it.
-Tail pipe side-
-Engine side-
Trending Topics
04-15-2012, 08:55 PM
#8
Super Member
Join Date: Apr 2006
Location: Raleigh NC
Posts: 796
Likes: 0
Received 0 Likes
on
0 Posts
2007 E63, 2006 C55
R230 V12 Cats
+1. Only 1 set of cats on V12 SL.
Stock exhaust is pretty stout out of the box, huge piping stepped down progressively in diameter from front to rear. Just remove the rear mufflers if you want better sound and maybe a smidgen better flow.
Stock exhaust is pretty stout out of the box, huge piping stepped down progressively in diameter from front to rear. Just remove the rear mufflers if you want better sound and maybe a smidgen better flow.
04-16-2012, 01:38 PM
#9
Super Member
It's seems that somebody have two cats like this setup at this drawing.
I have a friend in Germany who have this setup at his SL600.... and he have imported it from USA.
So maybe this is why Mercedes give two different hp numbers at the same engine.... 500 hp and 517 hp?
500 hp have two cats.... (first and secondary with resomnators) and 517 have only first cats setup with H-pipe.
Here is few pictures from my exhaust systeem and I think it's OEM.
Last edited by Ekselent; 04-16-2012 at 01:46 PM.
04-16-2012, 06:09 PM
#10
MBWorld Fanatic!
Join Date: Feb 2004
Location: Southern, CA.
Posts: 9,155
Likes: 0
Received 19 Likes
on
18 Posts
V12-Biturbo
US R230 SL600/65 models have what appears to be (1) giant pair of cats, but if you remove them & look inside them you will see where the 2nd set of cats went lol... The giant pair is actually a set of (2) side by side ie (4) total, they welded both pairs together equaling what apears to be only (1) pair from outside but indeed there are (4) cats inside that mini-beer keg exterior.
Remove them ALL for an easy 30+ rwhp
Remove them ALL for an easy 30+ rwhp
Last edited by Thericker; 04-16-2012 at 06:17 PM.
04-17-2012, 11:46 AM
#12
Super Member
Join Date: Jan 2007
Location: Sleepy Hollow, IL
Posts: 852
Likes: 0
Received 2 Likes
on
2 Posts
65 Chevelle Wagon w/ C5 frame, 08 ML63, 04 S600, 04 E55,(sold) 00 ML55,(sold) 98 C43-55K Swap
US R230 SL600/65 models have what appears to be (1) giant pair of cats, but if you remove them & look inside them you will see where the 2nd set of cats went lol... The giant pair is actually a set of (2) side by side ie (4) total, they welded both pairs together equaling what apears to be only (1) pair from outside but indeed there are (4) cats inside that mini-beer keg exterior.
Remove them ALL for an easy 30+ rwhp
Remove them ALL for an easy 30+ rwhp
All m275's have primary and secondary cats in the same housing. The post cat o2 is in the middle of the "beer keg"
04-17-2012, 04:18 PM
#13
Super Member
US R230 SL600/65 models have what appears to be (1) giant pair of cats, but if you remove them & look inside them you will see where the 2nd set of cats went lol... The giant pair is actually a set of (2) side by side ie (4) total, they welded both pairs together equaling what apears to be only (1) pair from outside but indeed there are (4) cats inside that mini-beer keg exterior.
Remove them ALL for an easy 30+ rwhp
Remove them ALL for an easy 30+ rwhp
"Mini - beer keg"... where is it at the car?
Do you mean at the same keg where the first cats are?
Welded together?
Juha
04-17-2012, 04:56 PM
#14
MBWorld Fanatic!
Join Date: Feb 2004
Location: Southern, CA.
Posts: 9,155
Likes: 0
Received 19 Likes
on
18 Posts
V12-Biturbo
Last edited by Thericker; 04-17-2012 at 05:05 PM.
04-17-2012, 05:11 PM
#16
Super Member
Thank you....
My friend in Germany saw my (OEM PICTURES ) setup and he told me that it seems Mercedes SL600 use two differenet type of exhaust systems.
One that I have and one same as this picture show. He had this at his car and he have removed "undefloor catalytic converters 158".
So now we all know how it is...
07-05-2012, 11:51 PM
#17
Junior Member
Join Date: Jul 2012
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
CL55 AMG
I have an 03 CL55 & i want to make some changes to the exhaust. What sort of sound would I get from removing the secondary cats and resonators ONLY ? Would I see power gains from doing that? Any suggestions? should i set up an x-pipe instead of the secondary cats or not. I will leave the primary cats to avoid any problems with the O2 sensors.
thanks
thanks
