V12 secondary cats??

Auraraptor · 04-14-2012, 12:32 AM

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-

To remove this ad, register today or login if you already are registered!

Auraraptor · 04-14-2012, 01:22 AM

Turns out, I am correct:

Notice the parts diagram, only V8/SL55s have the secondary cats:

Vabene7 · 04-14-2012, 07:01 AM

There are def secondary cats on an S600. I know because I had them removed....

-Chris

Auraraptor · 04-14-2012, 11:43 AM

Strange.. any other SL owners know?

WHTEVO · 04-14-2012, 03:26 PM

My 07 only has the two main cats.

Aaron

Benz-O-Rama · 04-14-2012, 05:43 PM

Only 1 set of cats on V12 SL

abiazis · 04-14-2012, 06:47 PM

One set of cats on a SL 65...

NCE500 · 04-15-2012, 08:55 PM

+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.

Ekselent · 04-16-2012, 01:38 PM

Quote:

Originally Posted by Auraraptor

Turns out, I am correct:

Notice the parts diagram, only V8/SL55s have the secondary cats:

I have only one set of cats and they are front cats at my SL600....
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.

Thericker · 04-16-2012, 06:09 PM

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

Vabene7 · 04-16-2012, 10:03 PM

Sorry, I kind of misread......thinking you were referring to an S, not SL.

stockC43 · 04-17-2012, 11:46 AM

Quote:

Originally Posted by Thericker

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

Correct

All m275's have primary and secondary cats in the same housing. The post cat o2 is in the middle of the "beer keg"

Ekselent · 04-17-2012, 04:18 PM

Quote:

Originally Posted by Thericker

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

.

"Mini - beer keg"... where is it at the car?
Do you mean at the same keg where the first cats are?
Welded together?

Juha

Thericker · 04-17-2012, 04:56 PM

Quote:

Originally Posted by Ekselent

.

"Mini - beer keg"... where is it at the car?
Do you mean at the same keg where the first cats are?
Welded together?

Juha

Yes... Using this diagram it's the very front near the Engine, the cats you want to remove are right behind Turbo's labeled "157 Firewall Catalytic Converter" on Diagram/List

Thericker · 04-17-2012, 05:03 PM

Quote:

Originally Posted by stockC43

Correct

All m275's have primary and secondary cats in the same housing. The post cat o2 is in the middle of the "beer keg"

Man knows what he's talking about

Ekselent · 04-17-2012, 05:11 PM

Quote:

Originally Posted by Thericker

Yes... Using this diagram it's the very front near the Engine, the cats you want to remove are right behind Turbo's labeled "157 Firewall Catalytic Converter" on Diagram/List

.

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...

mbegdouri · 07-05-2012, 11:51 PM

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

04-14-2012, 07:01 AM	#3
Vabene7 Super Member 2005 Mercedes-Benz 600-Class Join Date: Jun 2007 Location: The Jersey Shore Posts: 766 Drives: Garage Temporarily Empty	There are def secondary cats on an S600. I know because I had them removed.... -Chris __________________ BROADWAY PERFORMANCE TUNED / EUROCHARGED STAGE 1 / BMC FILTERS / DUAL RESONATOR DELETE / DMH ELECTRIC CUTOUTS / JOHNSON CM30 CHARGE PUMP / AKEBONO BRAKE PADS / STAR LOWERED MBWorld Gun Owner's Club Member #104

04-14-2012, 05:43 PM	#6
Benz-O-Rama MBWorld Fanatic! Garage is empty, add now Join Date: Apr 2006 Location: Maryland Posts: 7,780 Drives: Eurocharged Stage (1) 2004 E500, OE Tuning/Speedriven ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon	Only 1 set of cats on V12 SL __________________ 2010 CTS SportWagon 2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust (13.49@102.5) 2005 SL600 - OE Tuning ECU/ Speedriven TCU - (11.02@126.01) ..And some bad **** teefusus. http://www.youtube.com/watch?v=jb1g_f_gBA0 Outfitted by:

04-14-2012, 06:47 PM	#7
abiazis Super Member Garage is empty, add now Join Date: Jul 2009 Location: Asheville, Atlanta Posts: 504 Drives: SL 65 AMG, Porsche 911 (993), 2011 Prius 5, 2013 Toyota Highlander Limited	Cats SL 65 One set of cats on a SL 65... __________________ 2005 Brilliant Silver/black-charcoal SL 65 AMG 1995 Grand Prix White/cashmere/blue top Porsche 911 Cab - 993 2011 Blizzard White/Sand Beige Prius 5 2013 Toyota Highlander Limited 4WD

04-15-2012, 08:55 PM	#8
NCE500 Super Member Garage is empty, add now Join Date: Apr 2006 Location: Raleigh NC Posts: 798 Drives: 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. __________________ 2007 E63 Silver/Ash, P2, Pano, Parktronic, trunk closer, loaded 2006 C55, Black/Black, Premium and Lighting Packages, Navi 2011 Corvette Grand Sport Convertible, Silver/Gray/Blue, every option 2005 SL600 Capri Blue/Ash, AMG Package, Distronic, Keyless Go, Pano, Parktronic, TPMS - Sold

04-16-2012, 06:09 PM	#10
Thericker MBWorld Fanatic! Garage is empty, add now Join Date: Feb 2004 Location: Southern, CA. Posts: 7,842 Drives: 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 Last edited by Thericker; 04-16-2012 at 06:17 PM.

04-14-2012, 01:22 AM	#2
Auraraptor Super Member Garage is empty, add now Join Date: Nov 2005 Location: Cold Snowy North Posts: 688 Drives: -	Turns out, I am correct: Notice the parts diagram, only V8/SL55s have the secondary cats:

04-14-2012, 11:43 AM	#4
Auraraptor Super Member Garage is empty, add now Join Date: Nov 2005 Location: Cold Snowy North Posts: 688 Drives: -	Strange.. any other SL owners know?

04-14-2012, 03:26 PM	#5
WHTEVO MBWorld Fanatic! Garage is empty, add now Join Date: Jul 2010 Location: Colorado Posts: 1,151 Drives: 07' SL65, 04' E55, 03' Evo8, 08' GSXR, DSM's...	My 07 only has the two main cats. Aaron

04-16-2012, 10:03 PM	#11
Vabene7 Super Member 2005 Mercedes-Benz 600-Class Join Date: Jun 2007 Location: The Jersey Shore Posts: 766 Drives: Garage Temporarily Empty	Sorry, I kind of misread......thinking you were referring to an S, not SL. __________________ BROADWAY PERFORMANCE TUNED / EUROCHARGED STAGE 1 / BMC FILTERS / DUAL RESONATOR DELETE / DMH ELECTRIC CUTOUTS / JOHNSON CM30 CHARGE PUMP / AKEBONO BRAKE PADS / STAR LOWERED MBWorld Gun Owner's Club Member #104

07-05-2012, 11:51 PM	#17
mbegdouri Junior Member Garage is empty, add now Join Date: Jul 2012 Posts: 16 Drives: 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

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread: