W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Secondary Cat? Advanges and Disadvangtes?

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Old Nov 25, 2010 | 02:32 AM
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Question Secondary Cat? Advanges and Disadvangtes?

Sorry for my dump questions,

I would like to know where is the secondary Cats? Any pics that will help ?

What are the advantages and disadvantages of deleting them?
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Old Nov 25, 2010 | 04:27 AM
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I have looked through old threads, I want to know if I took out the secondary cat and left the Resonator, will it effect my HP?, and will I need to re tune my car?
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Old Nov 25, 2010 | 09:08 AM
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maybe gain 1-5hp, will not need a tune
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Old Nov 25, 2010 | 02:37 PM
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Originally Posted by shardul
maybe gain 1-5hp, will not need a tune
Thanx shardul for the reply, get something better than nothing, and at least the car may breath better
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Old Nov 25, 2010 | 02:45 PM
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Originally Posted by ahmad0658
Sorry for my dump questions,

I would like to know where is the secondary Cats? Any pics that will help ?

What are the advantages and disadvantages of deleting them?
here ya go, I hear that if you remove the secondaries that you will lose some (may only be able to tell on the dyno) bottom end torque????
Attached Thumbnails Secondary Cat? Advanges and Disadvangtes?-underside.jpg  

Last edited by Hammer Down; Nov 25, 2010 at 02:48 PM.
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Old Nov 25, 2010 | 02:55 PM
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not sure about a loss of HP, but mine still ran a high 11 with these deleted. I do warn you though that the secondary cats are in an akward place. Deleting these can be a lil tricky so take your car to an exhaust shop you know. there is a crossover pipe that connects the exhaust just before the secondary cats. This connection needs to stay intact so keep that in mind.
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Old Nov 25, 2010 | 04:22 PM
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E55 2003, C32 2002,
Originally Posted by N2DP2QT
not sure about a loss of HP, but mine still ran a high 11 with these deleted. I do warn you though that the secondary cats are in an akward place. Deleting these can be a lil tricky so take your car to an exhaust shop you know. there is a crossover pipe that connects the exhaust just before the secondary cats. This connection needs to stay intact so keep that in mind.
If this crossover pipe is kept , what is the adventage? is it to keep the torque
from falling? or something else?
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Old Nov 25, 2010 | 05:58 PM
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You do not need to keep that crossover pipe! If you go with an x-pipe or straight pipes it will still be better than the stock set-up. Also, you gain power by removing the 2nd cats and not lose. The power loss comes from removing the resonator which I can attest to since I just had it done. The car does not feel as violent at take off. Hope this helps
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Old Nov 25, 2010 | 08:49 PM
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Originally Posted by N2DP2QT
not sure about a loss of HP, but mine still ran a high 11 with these deleted. I do warn you though that the secondary cats are in an akward place. Deleting these can be a lil tricky so take your car to an exhaust shop you know. there is a crossover pipe that connects the exhaust just before the secondary cats. This connection needs to stay intact so keep that in mind.
Ohhh, I have different set up in my car because it is Brabus K8 where I have Brabus Exhaust (some box also before the muffler). It does not look like the one in the pic. It is two straight separate pipes from headers all the way to each exhaust.

Even the cats that I have does not look like thos, they look a little bit smaller and looks more circular a little bit
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Old Nov 25, 2010 | 08:53 PM
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Originally Posted by mikey33
You do not need to keep that crossover pipe! If you go with an x-pipe or straight pipes it will still be better than the stock set-up. Also, you gain power by removing the 2nd cats and not lose. The power loss comes from removing the resonator which I can attest to since I just had it done. The car does not feel as violent at take off. Hope this helps

Nice to hear from you Mikey that straight pipes is also good option coz I have straight pipes and not attached as in the pic.
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