Secondary Cat? Advanges and Disadvangtes?
Thread Starter
Super Member
Joined: Oct 2009
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From: Saudi Arabia - Qatif
Brabus K8 E55 05
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?
I would like to know where is the secondary Cats? Any pics that will help ?
What are the advantages and disadvantages of deleting them?
Thread Starter
Super Member
Joined: Oct 2009
Posts: 661
Likes: 3
From: Saudi Arabia - Qatif
Brabus K8 E55 05
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?
Thread Starter
Super Member
Joined: Oct 2009
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From: Saudi Arabia - Qatif
Brabus K8 E55 05
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From: Bay Area
2015 E63S, 2018 E63S
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????
Last edited by Hammer Down; Nov 25, 2010 at 02:48 PM.
Newbie
Joined: Oct 2010
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2004 E55 AMG
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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E55 2003, C32 2002,
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.
from falling? or something else?
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2004 E55, 1997 E320 "Sold"
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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Thread Starter
Super Member
Joined: Oct 2009
Posts: 661
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From: Saudi Arabia - Qatif
Brabus K8 E55 05
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.
Even the cats that I have does not look like thos, they look a little bit smaller and looks more circular a little bit
Thread Starter
Super Member
Joined: Oct 2009
Posts: 661
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From: Saudi Arabia - Qatif
Brabus K8 E55 05
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.
