SL/R230 Removing cats on R230 - MBWorld.org Forums

Jun 30, 2014 | 03:35 PM

Ron Martin

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Joined: Jun 2009

Posts: 96

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From: Tampa

2003 R230 and 2007 W209

Removing cats on R230

Guys,

Can ANYONE provide experience on merely removing the cats ..NOT the "mufflers" on the R230 and dealing with their four O2 sensors ? ( two front and two rear) While cutting and straight piping (gapping) the new spaces where the 'old' cats were might seem simple ...It appears the MAIN issue to solve - is dealing with - short circuiting the (now disconnected) O2 sensors data and avoiding the CEL lights that will illuminate... I understand there is some long plug attachments that can be attached to bypass the (now) missing O2 sensor data and keep the CEL lights OFF.

ANY info GREATLY appreciated ..

rwm

Jun 30, 2014 | 03:40 PM

V12TTenthusiast

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Joined: Jul 2013

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06 SL65AMG, 13 Tesla Model S 60kwh, 02 Jaguar S-Type 3.0, 12 S550 4 Matic, 07 E320 Bluetec, 06 LX470

Yeah long 90 degree O2 simulators will bypass CEL, I have it on my custom 3 inch exhaust on my SL65 that has no cats

Jun 30, 2014 | 04:19 PM

Ron Martin

Thread Starter

Member

Joined: Jun 2009

Posts: 96

Likes: 9

From: Tampa

2003 R230 and 2007 W209

Thanks for your prompt response..

WHERE do I find these things ? There must be some supply sources somewhere and ..how many do I need ..four ?

Thanks,

Ron

Jul 9, 2014 | 04:10 AM

RNSL65

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Joined: May 2008

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From: Denmark

SL65 AMG, X5-4.8i M-Sport, 530D, 528i

Hi

So what's the difference when the CATs are removed. More power better sound or?

My SL65 with Kleemann ECU+TCU tune sounds really nice with mufflers removed.

Jul 9, 2014 | 10:13 AM

markinofficeuk

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Joined: Nov 2013

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R230

Removing the CATs

I removed both CATs and my enjoyment of the car has greatly improved. The resulting sound gives a great V8 grunt without being too loud. There is a sweet spluttering sound at low revs with a deep and powerful sounding exhaust when pulling away. I've had no problems with error messages and the car has passed the emmission tests without issue. My view is that the four CATs are an over-design. If you are overly concerned about the enevironment you shouldn't be driving a 5 Litre V8. If they rattle...take'em out.

Jul 9, 2014 | 11:08 AM

RNSL65

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Joined: May 2008

Posts: 108

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From: Denmark

SL65 AMG, X5-4.8i M-Sport, 530D, 528i

Anyone on the SL65 6.0 TT engine, there is "only" two cats here?

Jul 10, 2014 | 12:58 AM

V12TTenthusiast

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Joined: Jul 2013

Posts: 930

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06 SL65AMG, 13 Tesla Model S 60kwh, 02 Jaguar S-Type 3.0, 12 S550 4 Matic, 07 E320 Bluetec, 06 LX470

On the SL65 I've heard some people saying cutting the 2 cats will make HP difference and some say it wont, but this being a turbo car I would think so. From my experince I did gain HP on the dyno with my catless downpipes but my downpipes are 3 inch, as well as my entire custom exhaust.

However with a 3 inch fully custom exhaust the airboxes in my car were restricting air, and I was loosing HP. I had to toss those out and do a custom intake to see higher gains (564 rwhp with just ecu tune to 638 rwhp with exhaust, intake, ecu)