For those who have headers on their C55
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MBWorld Fanatic!
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From: New Zealand
For those who have headers on their C55
I figure more people have done headers here than the CLK55 forum but an M113 is an M113. I am considering having custom headers made, stainless long tube 4-1 with slip joins and ceramic coated inside and out. My local shop does an awesome warranty on leaking, cracks etc and has an excellent reputation. This will of course eliminate the primary cats.
- Are the secondary cats enough to stop the smell of gas with the primaries gone?
- Would these alterations with an otherwise completely stock exhaust be at all loud? Mainly I don't want to annoy the neighbors with cold starts as I live in a townhouse complex (in garage, door open).
- I presume a tune is required to get rid of the CEL? Are there any other options to get rid of it before having a tune done?
- Are the secondary cats enough to stop the smell of gas with the primaries gone?
- Would these alterations with an otherwise completely stock exhaust be at all loud? Mainly I don't want to annoy the neighbors with cold starts as I live in a townhouse complex (in garage, door open).
- I presume a tune is required to get rid of the CEL? Are there any other options to get rid of it before having a tune done?
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From: Orlando FL
CLK55 AMG
the secondaries might be able to mask the smell but maybe not. I did shorties on my w209 55. they were good until they cracked but they were cheap. longtubes will be a bit louder than the shorties but not by much. it should be relatively quiet
Senior Member
Joined: Oct 2010
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C55 AMG T with Kleemann K2 and some stuff: 414 hp and 562 Nm :-)
I have Kleemanns mid/long-tubes.
Primary cats gone of course and the secondaries take very well care of
exhaustfumes in my countrys sniff-test. Actually they have said several
times my exhausts are very clean!
I´ve kept the rest of the exhaustsystem untouched, with a very nice
sound left. Not too loud. Tried for some time without the resonator but
it was far too loud for me, put it back on.
ECU-tune is a must to get all the power out of the headers, and to turn off
the CEL.
Primary cats gone of course and the secondaries take very well care of
exhaustfumes in my countrys sniff-test. Actually they have said several
times my exhausts are very clean!
I´ve kept the rest of the exhaustsystem untouched, with a very nice
sound left. Not too loud. Tried for some time without the resonator but
it was far too loud for me, put it back on.
ECU-tune is a must to get all the power out of the headers, and to turn off
the CEL.
Thread Starter
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,428
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From: New Zealand
Thanks for the feedback, I won't bother with primaries then.
I found your topspeed thread again c32. I can't believe the stock headers have a 1.6" exit, thats 41mm for us metric people, insanely small. I would consider 2.25" barely adequate. Not that I know what is inside the resonators or mufflers but surely this must be by far the main restriction in the exhaust.
Good to know I won't wake up the neighborhood. I like to fly under the radar, at least near home.
I found your topspeed thread again c32. I can't believe the stock headers have a 1.6" exit, thats 41mm for us metric people, insanely small. I would consider 2.25" barely adequate. Not that I know what is inside the resonators or mufflers but surely this must be by far the main restriction in the exhaust.
Good to know I won't wake up the neighborhood. I like to fly under the radar, at least near home.
Senior Member
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C55 AMG T with Kleemann K2 and some stuff: 414 hp and 562 Nm :-)
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From: Orlando FL
CLK55 AMG
while primarys are restrictive, they provide the necessary back pressure for our vehicles. this is where all our low end power comes from. cats really aren't restrictive anyway. they cant be too restrictive. if they were really as restrictive as people say, it would defeat the purpose of them. the combustion chamber temps would rise affecting emissions.
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Member
Joined: Feb 2014
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From: Kirkland, WA
2005 C55
With respect, I beg to differ on 'necessary back pressure'. Exhaust gas velocity at lower RPMs is what brings the low end power.
Myths about "back-pressure"
http://www.mustangevolution.com/forum/f312/t296628/
Myths about "back-pressure"
http://www.mustangevolution.com/forum/f312/t296628/
Thread Starter
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From: New Zealand
Good read. I learnt from previous cars that bigger is usually worse. Mild to moderate increase in sizing with a better design usually increases torque throughout most of the rev range. Otherwise it comes back to being a trade off and certainly low rpm torque is the most enjoyable for a daily driver around town.
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From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
With respect, I beg to differ on 'necessary back pressure'. Exhaust gas velocity at lower RPMs is what brings the low end power.
Myths about "back-pressure"
http://www.mustangevolution.com/forum/f312/t296628/
Myths about "back-pressure"
http://www.mustangevolution.com/forum/f312/t296628/
Senior Member
Joined: Oct 2010
Posts: 380
Likes: 47
C55 AMG T with Kleemann K2 and some stuff: 414 hp and 562 Nm :-)
If you decide to go with Kleemann mid/long-tube headers or similar,
you have to get rid of primaries since there´s no room. They´re designed
that way. If you want to change secondaries to racecats, no problems but
the gains are max 5 hp. It´s been discussed here before.
Use the search-engine and you will find a lot of useful information here!
you have to get rid of primaries since there´s no room. They´re designed
that way. If you want to change secondaries to racecats, no problems but
the gains are max 5 hp. It´s been discussed here before.
Use the search-engine and you will find a lot of useful information here!
Last edited by amgen; Feb 26, 2015 at 05:23 PM.
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PLAID
If you decide to go with Kleemann mid/long-tube headers or similar,
you have to get rid of primaries since there´s no room. They´re designed
that way. If you want to change secondaries to racecats, no problems but
the gains are max 5 hp. It´s been discussed here before.
Use the search-engine and you will find a lot of useful information here!
you have to get rid of primaries since there´s no room. They´re designed
that way. If you want to change secondaries to racecats, no problems but
the gains are max 5 hp. It´s been discussed here before.
Use the search-engine and you will find a lot of useful information here!
Thread Starter
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,428
Likes: 288
From: New Zealand
Unfortunately being right hand drive I cannot use any off the shelf headers that I am aware of. The kleemann mid length require work to make it fit around the steering column. By the time I pay shipping, import tax and the exchange rate I would have more than paid for custom full length 4-1's and the merge collector they use is almost a masterpiece.
I never considered a race cat in place of the secondaries. Good idea; I would consider that if I was annoyed with the smell of gas I think.
I never considered a race cat in place of the secondaries. Good idea; I would consider that if I was annoyed with the smell of gas I think.
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Joined: Feb 2004
Posts: 1,001
Likes: 37
From: NY
2014 E350 4Matic
I have Kleemanns mid/long-tubes.
Primary cats gone of course and the secondaries take very well care of
exhaustfumes in my countrys sniff-test. Actually they have said several
times my exhausts are very clean!
I´ve kept the rest of the exhaustsystem untouched, with a very nice
sound left. Not too loud. Tried for some time without the resonator but
it was far too loud for me, put it back on.
ECU-tune is a must to get all the power out of the headers, and to turn off
the CEL.
Primary cats gone of course and the secondaries take very well care of
exhaustfumes in my countrys sniff-test. Actually they have said several
times my exhausts are very clean!
I´ve kept the rest of the exhaustsystem untouched, with a very nice
sound left. Not too loud. Tried for some time without the resonator but
it was far too loud for me, put it back on.
ECU-tune is a must to get all the power out of the headers, and to turn off
the CEL.
