SL55/63/65/R230 AMG: V12 secondary cats??
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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-
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From: Raleigh NC
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.
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From: Finland
SL600 / SL450 (107) / E350 / BMW M5 E60 / BMW 745i (E23) / BMW X6M / Toyota Hilux 4 WD/ Honda CBX 10
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; Apr 16, 2012 at 01:46 PM.
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From: Southern, CA.
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; Apr 16, 2012 at 06:17 PM.
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From: Sleepy Hollow, IL
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"
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From: Finland
SL600 / SL450 (107) / E350 / BMW M5 E60 / BMW 745i (E23) / BMW X6M / Toyota Hilux 4 WD/ Honda CBX 10
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
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V12-Biturbo
Last edited by Thericker; Apr 17, 2012 at 05:05 PM.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 9,155
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From: Southern, CA.
V12-Biturbo
Super Member
Joined: Jan 2012
Posts: 883
Likes: 24
From: Finland
SL600 / SL450 (107) / E350 / BMW M5 E60 / BMW 745i (E23) / BMW X6M / Toyota Hilux 4 WD/ Honda CBX 10
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...
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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
