Removing CATS
MBWorld Fanatic!
Joined: Dec 2009
Posts: 1,464
Likes: 73
From: Midwest, US
'17 GTR, '17 GLC43, '14 Panigale 899, '20 V4
Senior Member
Joined: Mar 2009
Posts: 451
Likes: 1
From: S.F. Bay Area
2008 C300 Sport, 2010 RX350 AWD
Doesn't matter if it's MB or Honda, or Toyota, BMW, Ford for that matter..
They all have O2 sensors and EGR now days..
Remove the CATS will trigger CEL because O2 sensors will see same levels of emissions and ECU will think your CATS is not working properly and give you the CEL..
One way to fool the ECU is to get O2 sensor simulator and fool the ecu to think everything is working properly
MBWorld Fanatic!
Joined: Dec 2009
Posts: 1,464
Likes: 73
From: Midwest, US
'17 GTR, '17 GLC43, '14 Panigale 899, '20 V4
You obviously have no idea how emission system works on modern cars..
Doesn't matter if it's MB or Honda, or Toyota, BMW, Ford for that matter..
They all have O2 sensors and EGR now days..
Remove the CATS will trigger CEL because O2 sensors will see same levels of emissions and ECU will think your CATS is not working properly and give you the CEL..
One way to fool the ECU is to get O2 sensor simulator and fool the ecu to think everything is working properly
Doesn't matter if it's MB or Honda, or Toyota, BMW, Ford for that matter..
They all have O2 sensors and EGR now days..
Remove the CATS will trigger CEL because O2 sensors will see same levels of emissions and ECU will think your CATS is not working properly and give you the CEL..
One way to fool the ECU is to get O2 sensor simulator and fool the ecu to think everything is working properly
Senior Member
Joined: Mar 2009
Posts: 451
Likes: 1
From: S.F. Bay Area
2008 C300 Sport, 2010 RX350 AWD
Member
Joined: Oct 2010
Posts: 129
Likes: 0
White 2010 C300 Sport
You obviously have no idea how emission system works on modern cars..
Doesn't matter if it's MB or Honda, or Toyota, BMW, Ford for that matter..
They all have O2 sensors and EGR now days..
Remove the CATS will trigger CEL because O2 sensors will see same levels of emissions and ECU will think your CATS is not working properly and give you the CEL..
One way to fool the ECU is to get O2 sensor simulator and fool the ecu to think everything is working properly
Doesn't matter if it's MB or Honda, or Toyota, BMW, Ford for that matter..
They all have O2 sensors and EGR now days..
Remove the CATS will trigger CEL because O2 sensors will see same levels of emissions and ECU will think your CATS is not working properly and give you the CEL..
One way to fool the ECU is to get O2 sensor simulator and fool the ecu to think everything is working properly
i was referring to this specific case smart guy...ive seen it done no errors..im very well off on knowing my cars
Senior Member
Joined: Mar 2009
Posts: 451
Likes: 1
From: S.F. Bay Area
2008 C300 Sport, 2010 RX350 AWD
I can't fault you, since it's pretty obvious the most valuable thing you own is the C you are driving and you probably don't have much experience w/ luxury cars...
Member
Joined: Oct 2010
Posts: 129
Likes: 0
White 2010 C300 Sport
You obvoiusly doesn't know the difference between completely take out the CATS (there are 4 total for our w204) and take only secondary CATS out..
I can't fault you, since it's pretty obvious the most valuable thing you own is the C you are driving and you probably don't have much experience w/ luxury cars...
I can't fault you, since it's pretty obvious the most valuable thing you own is the C you are driving and you probably don't have much experience w/ luxury cars...
really..good thing my first car was a 2001 cl600...
Senior Member
Joined: Mar 2009
Posts: 451
Likes: 1
From: S.F. Bay Area
2008 C300 Sport, 2010 RX350 AWD
So if all OP want is better sound, I would think remove secondary CATS and resonators will be sufficient..(with maybe 2-3HP gain)
However, if you really want to get it right and gain about 10HP, I would look into change all 4 CATS to state legal high-flow ones, then not only will you get the sound you want, (it will be the deep roaring type not the rice out Honda Civic type with no real bass), gain HP, and still compliance to state law and be environmental friendly..
However, if you really want to get it right and gain about 10HP, I would look into change all 4 CATS to state legal high-flow ones, then not only will you get the sound you want, (it will be the deep roaring type not the rice out Honda Civic type with no real bass), gain HP, and still compliance to state law and be environmental friendly..
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Senior Member
Joined: Mar 2009
Posts: 451
Likes: 1
From: S.F. Bay Area
2008 C300 Sport, 2010 RX350 AWD
Since when is RX considered a rice car?? I don't see many if not any of them rolling here in CA modded like a rice out Civic which I am sure your 2001 Civic must have been...lol
Anyway..the RX is for the wife, was looking at GLK, Q5 & MDX but decide to go w/ RX since it's not going to be my primary ride, so I just want something that's easy to take care..
BTW..how much did you sell that 2001 Civic LX for?? I hope you was able to get enough $$ to cover all the mods you did on your C300..lol
All kidding aside, you did good w/ your c300..like the black/white/carbon fiber look..
Anyway..the RX is for the wife, was looking at GLK, Q5 & MDX but decide to go w/ RX since it's not going to be my primary ride, so I just want something that's easy to take care..
BTW..how much did you sell that 2001 Civic LX for?? I hope you was able to get enough $$ to cover all the mods you did on your C300..lol
All kidding aside, you did good w/ your c300..like the black/white/carbon fiber look..
Super Moderator
Joined: Jul 2006
Posts: 3,365
Likes: 12
From: Orange County, CA
GMC - Miata - Trek - P-Car
As a California resident, I'm surprised that you don't know that you won't be able to license the car the next time because of the stored failure code. Further, the mixture is regulated by inputs from the four O2 sensors. Here in Washington the first emission test is after the car is five year sold but CARB being what it is, that may not be California's practice...
Acceptable performance and air quality are not necessarily mutually exclusive. My lowly C consistently traps ~110 mph with its post-manifold OE exhaust system entirely intact. Most certainly complies with the spirit -if not the letter- of currently applicable legislation. They’ll always sound pretty much like any other farty V6.
reference:
http://www.dmv.ca.gov/vr/smogfaq.htm#BM2535
Newbie
Joined: Nov 2010
Posts: 3
Likes: 0
2005 Pontiac GTO
I will never move to CA. Pretty soon they will mandate everyone to drive Smart cars.
In the Chicagoland area, visual inspections are non-existent. I filled the emissions place up with my noxious fumes while I idled like a Harley and they never batted an eye. No codes, no prob. Oh the wonders of a properly tuned vehicle.
In the Chicagoland area, visual inspections are non-existent. I filled the emissions place up with my noxious fumes while I idled like a Harley and they never batted an eye. No codes, no prob. Oh the wonders of a properly tuned vehicle.
Member
Joined: Nov 2009
Posts: 126
Likes: 0
From: Punjab, India
2018 S350 D, 2011 E350 Coupe, 2017 G63 AMG, 2017 Ford Mustang
All said and done, but, can't we get some clips to actually hear what it sounds like?!! I've had an x-pipe and a Meisterschaft running on my 204 since the past 6-7 months. It sounds amazing. But I really wanted to get it to sound louder and more raw-ish. Can't find any HFCs. Was also planning on getting the exhaust header from Kleemann installed. So it's obvious that I'm highly confused. =( HELP!!
Video link to my 204... http://www.youtube.com/watch?v=dQPZjGrxv0g
Video link to my 204... http://www.youtube.com/watch?v=dQPZjGrxv0g
Thread Starter
Member
Joined: Mar 2010
Posts: 214
Likes: 0
From: LA
MB C-300 Sport 2009 Manual Black XPIPE+Exhaust
All said and done, but, can't we get some clips to actually hear what it sounds like?!! I've had an x-pipe and a Meisterschaft running on my 204 since the past 6-7 months. It sounds amazing. But I really wanted to get it to sound louder and more raw-ish. Can't find any HFCs. Was also planning on getting the exhaust header from Kleemann installed. So it's obvious that I'm highly confused. =( HELP!!
Video link to my 204... http://www.youtube.com/watch?v=dQPZjGrxv0g
Video link to my 204... http://www.youtube.com/watch?v=dQPZjGrxv0g
MBWorld Fanatic!
Joined: Jul 2008
Posts: 2,439
Likes: 0
From: The Jersey Shore
W204 Color: 090 / 1999 Honda Civic EX / 2003 Acura TL
you have the Meisterchaft GT exhaust with SR pipes installed?
All said and done, but, can't we get some clips to actually hear what it sounds like?!! I've had an x-pipe and a Meisterschaft running on my 204 since the past 6-7 months. It sounds amazing. But I really wanted to get it to sound louder and more raw-ish. Can't find any HFCs. Was also planning on getting the exhaust header from Kleemann installed. So it's obvious that I'm highly confused. =( HELP!!
Video link to my 204... http://www.youtube.com/watch?v=dQPZjGrxv0g
Video link to my 204... http://www.youtube.com/watch?v=dQPZjGrxv0g
Member
Joined: Nov 2009
Posts: 126
Likes: 0
From: Punjab, India
2018 S350 D, 2011 E350 Coupe, 2017 G63 AMG, 2017 Ford Mustang
No SR pipes bud! Just a Magnaflow X-Pipe. I got the connectors from the stock exhaust to fit into this one. Got them welded on.
Member
Joined: Nov 2009
Posts: 126
Likes: 0
From: Punjab, India
2018 S350 D, 2011 E350 Coupe, 2017 G63 AMG, 2017 Ford Mustang
Haha! Thanks Alex! Glad you like it. And I know it's been a long time. The increasing competition in the market has been keeping us way too busy. But we've got a bright future ahead, there's a lot of stir regarding the SLK and CLS, 2011 will be a game changer. Hope your Benz is treating you well! 
