Keeping Primary+2nd Cats on C55 but increasing sound?
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From: CA
03' CL600
Keeping Primary+2nd Cats on C55 but increasing sound?
I've got the resonator delete but I still think the car sounds too tame. I don't want to remove the primary+2nd cats because of smog in California.
What options besides adding headers and custom piping from the 2nd catback can I do to increase the sound?
The sound I'm looking is like the C63 preferrably but probably not possible.
What options besides adding headers and custom piping from the 2nd catback can I do to increase the sound?
The sound I'm looking is like the C63 preferrably but probably not possible.
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From: CA
03' CL600
I believe I can get away with swapping in a 200 cell cats on the secondary and staying smog legal and eliminating the drone effect. Question is where to find 200 cell cats and what is a fair price for a shop to install these?
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2016 Chevrolet SS, 2006 Cadillac STS-V
There's no drone without the resonator and secondary cats. I had my car like that for over a year. I still don't have any drone with Kleemann headers and two tiny 100-cell cats and custom pipe to the mufflers.
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C55 AMG, 300D-T & Karmann Ghia
I just removed the secondaries this weekend after running without a resonator for six months. The resonator removal alone created somewhat of a muted growl once removed and for quite a while I was happy with that.
I commissioned a tailored Eurocharged ECU tune and specified deleted secondaries since I figured I would do it down the road. I drove the car for a month delighted with the tune and still holding off on the secondaries. After seeing enough stock C63s, E63s, CL63s etc downtown- I began to have sound envy. I finally did the secondaries and I really don't see why I waited so long.
There really isn't any drone like I expected- it really shouldn't be regarded as a drone though there are rpms that emit a steady low growl. The noise on throttle is not unlike a C63 (though maybe not as polished) WOT is just right- It lets you know it is not stock and establishes the performance credibility that the C55 deserves. It sounds like a proper modern AMG V8.
I cannot see achieving this kind of sound without removing the secondaries- To do that you would have to go with different mufflers and I have always heard that the C55 mufflers are something worth keeping.
I commissioned a tailored Eurocharged ECU tune and specified deleted secondaries since I figured I would do it down the road. I drove the car for a month delighted with the tune and still holding off on the secondaries. After seeing enough stock C63s, E63s, CL63s etc downtown- I began to have sound envy. I finally did the secondaries and I really don't see why I waited so long.
There really isn't any drone like I expected- it really shouldn't be regarded as a drone though there are rpms that emit a steady low growl. The noise on throttle is not unlike a C63 (though maybe not as polished) WOT is just right- It lets you know it is not stock and establishes the performance credibility that the C55 deserves. It sounds like a proper modern AMG V8.
I cannot see achieving this kind of sound without removing the secondaries- To do that you would have to go with different mufflers and I have always heard that the C55 mufflers are something worth keeping.
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From: CA
03' CL600
I just removed the secondaries this weekend after running without a resonator for six months. The resonator removal alone created somewhat of a muted growl once removed and for quite a while I was happy with that.
I commissioned a tailored Eurocharged ECU tune and specified deleted secondaries since I figured I would do it down the road. I drove the car for a month delighted with the tune and still holding off on the secondaries. After seeing enough stock C63s, E63s, CL63s etc downtown- I began to have sound envy. I finally did the secondaries and I really don't see why I waited so long.
There really isn't any drone like I expected- it really shouldn't be regarded as a drone though there are rpms that emit a steady low growl. The noise on throttle is not unlike a C63 (though maybe not as polished) WOT is just right- It lets you know it is not stock and establishes the performance credibility that the C55 deserves. It sounds like a proper modern AMG V8.
I cannot see achieving this kind of sound without removing the secondaries- To do that you would have to go with different mufflers and I have always heard that the C55 mufflers are something worth keeping.
I commissioned a tailored Eurocharged ECU tune and specified deleted secondaries since I figured I would do it down the road. I drove the car for a month delighted with the tune and still holding off on the secondaries. After seeing enough stock C63s, E63s, CL63s etc downtown- I began to have sound envy. I finally did the secondaries and I really don't see why I waited so long.
There really isn't any drone like I expected- it really shouldn't be regarded as a drone though there are rpms that emit a steady low growl. The noise on throttle is not unlike a C63 (though maybe not as polished) WOT is just right- It lets you know it is not stock and establishes the performance credibility that the C55 deserves. It sounds like a proper modern AMG V8.
I cannot see achieving this kind of sound without removing the secondaries- To do that you would have to go with different mufflers and I have always heard that the C55 mufflers are something worth keeping.
If you don't mind telling me what the removal of the secondary cats cost?
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From: Northwest Indiana/ Chicago
2006 C55 AMG, 2005 E55 AMG
Just do it! Nothing else will really increase sound.. I have 2ndary and resonator off and theres no drone, it sounds great. Throwing Kleemann headers on in the spring time though b/c I like extra loud 
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From: Orange County
a land yacht.
One thing that might increase the sound a little is a true dual exhaust. But like everyone said before, delete the secondaries, it sounds great.
my car passed CA smog with no problems without a res or secondaries.
my car passed CA smog with no problems without a res or secondaries.
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From: SF Bay Area
C55 AMG, 300D-T & Karmann Ghia
I read that the car will take a little time to "learn" that you have modified the exhaust before it takes full advantage of the reduction in back-pressure. I have a flashed ECU, but I was just curious if people noticed that the car came into its own after a little while cat-less. Any changes in performance/feel/noise after some time? I have only had the secondaries removed for two days and am really happy already!
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From: CA
03' CL600
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From: SF Bay Area
C55 AMG, 300D-T & Karmann Ghia
No pics here, but don't have any trepidation that you may remove the wrong item... The two secondary cats are side by side at about the middle of the car, just before where the two exhaust pipes come together. You will be surprised to see how far forward the primaries and O2 sensors are! The resonator (I don't know if you've touched it yet) is the large cannister further down after the pipes merged into one.
Last edited by ghiaguy; Dec 17, 2012 at 03:01 PM.
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From: SF Bay Area
C55 AMG, 300D-T & Karmann Ghia
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From: CA
03' CL600
Searching the forums, here's the break-down of HP/TQ gains...
Summary of some of the NA 55 AMG 2nd cat dynos:
AMS 300cell 2nd cats = 10HP / 12 TQ Dyno Dynamics
Hooley 2nd delete = 13HP / 19 TQ Dyno Dynamics
Bryan's 2nd delete = 16HP / 22 TQ (dyno unknown, maybe dynojet?)
Summary of some of the NA 55 AMG 2nd cat dynos:
AMS 300cell 2nd cats = 10HP / 12 TQ Dyno Dynamics
Hooley 2nd delete = 13HP / 19 TQ Dyno Dynamics
Bryan's 2nd delete = 16HP / 22 TQ (dyno unknown, maybe dynojet?)
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From: CA
03' CL600
Now I'm curious about how much sound is increased with the following setup from 1 to 10 range. We'll set the stock setup at 1:
1) Stock = 1
2) Resonator Delete = ?
3) 2nd Cat Delete + Resonator Delete = ?
4) Primary Cat Delete + 2nd Cat Delete + Resonator Delete = ?
5) Kleemann Heaeders + 2nd Cat Delete + Resonator Delete = ?
1) Stock = 1
2) Resonator Delete = ?
3) 2nd Cat Delete + Resonator Delete = ?
4) Primary Cat Delete + 2nd Cat Delete + Resonator Delete = ?
5) Kleemann Heaeders + 2nd Cat Delete + Resonator Delete = ?
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C55 AMG, 300D-T & Karmann Ghia
Ill take a stab:
Now I'm curious about how much sound is increased with the following setup from 1 to 10 range. We'll set the stock setup at 1:
1) Stock = 1
2) Resonator Delete = 2.5 WOT
3) 2nd Cat Delete + Resonator Delete = 4.5 (but throatier)
4) Primary Cat Delete + 2nd Cat Delete + Resonator Delete = No idea
5) Kleemann Heaeders + 2nd Cat Delete + Resonator Delete = No idea
1) Stock = 1
2) Resonator Delete = 2.5 WOT
3) 2nd Cat Delete + Resonator Delete = 4.5 (but throatier)
4) Primary Cat Delete + 2nd Cat Delete + Resonator Delete = No idea
5) Kleemann Heaeders + 2nd Cat Delete + Resonator Delete = No idea
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From: CA
03' CL600
