Removing all four cats!!
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From: South FL & NYC
Your worst nightmare...
Removing all four cats!!
I am thinking of removing all four cats with the installation of my Kleeman headers. Need some advice, what will this do to my car, will there be any gains/losses. I made a search and could not come up with anything. The advice is appreciated. Thanks.
By the way they will custom make an exhaust that will run from the headers through where the secondary cats are.
By the way they will custom make an exhaust that will run from the headers through where the secondary cats are.
Out Of Control!!
Joined: Sep 2004
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From: San Diego
2015 S212
How much back pressure is needed is all about how much air are you pushing through. What mods do you have. If you are talking K4, then I'd say the OEM exhaust without cats would be CHERRY!! Personally, i get scared with messing with cats, especially with K / EVO (just because of the ECU crap). But if you are going there, why not go all out?
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Out Of Control!!
Joined: Sep 2004
Posts: 13,394
Likes: 6
From: San Diego
2015 S212
Yes. Actually that part is what scares me, since MB is trying to make it hard for the tuners to do by hiding the codes and continually changing them. The risk is that K / EVO can turn off the ecu's link to the o2 sensors, and then MB will release a new flash update that will undo it. Then K / EVO have to go figure it out again. It is a nasty revolving door. In the past, it was never enough of an issue that MB would get so involved. Now, I guess it is costing them enough to make them pay attention.
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From: mymbonline
mymbonline
if you loose anything it will br tq, not hp, you will more than likely gain hp up top.
if i get a 997s im gonna straight pipe it (after the cats though, no mufflers) and aftermarket headers, ill put it on the dyno before and after to see what happens
if i get a 997s im gonna straight pipe it (after the cats though, no mufflers) and aftermarket headers, ill put it on the dyno before and after to see what happens
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
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MBWorld Fanatic!
Joined: Mar 2004
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From: South FL & NYC
Your worst nightmare...
How much back pressure is needed is all about how much air are you pushing through. What mods do you have. If you are talking K4, then I'd say the OEM exhaust without cats would be CHERRY!! Personally, i get scared with messing with cats, especially with K / EVO (just because of the ECU crap). But if you are going there, why not go all out?
according to my mechanic this will be done, but let me not get ahead of myself one thing at a time...of course then I swap back to my regular ECU after i decide to just cruise.How much torque am i looking to loose, and of course I will gain a few ponies in the run that is always a plus...the torque is always in exageration...what good is it If i can't put it to the pavement.
Last edited by V12Godspeed; Nov 12, 2006 at 12:55 AM.
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From: school west coast-Summer Internships Va and Bmore
E55 (for sale if the right offer comes along)...too many others to list
Jody,
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
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MBWorld Fanatic!
Joined: Mar 2004
Posts: 5,768
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From: South FL & NYC
Your worst nightmare...
Jody,
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
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Jody,
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
I guess i will be seeing my dealer sometime this week.
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MBWorld Fanatic!
Joined: Mar 2004
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From: South FL & NYC
Your worst nightmare...
MBWorld Fanatic!
Joined: Jul 2005
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From: S.E. FLA.
05 ML-500 , 03 CLK5.5 AMG has left the Garage
Cats delete
A small token of thanks to the Svc Manager/ Writer & the tech , will always help them to remember your special requests. As Quoted by BENZ gal
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
Joined: Jul 2006
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From: Seattle
'19 E63S, ‘16 CLS63 RIP, '09 E63 Gone, '06 M5 Gone, '97 Supra TT Gone
Jody, usually I'm a *****-out kind of guy with my cars, but removing cats is a tricky process and while you may see some great performance gains on a heavily breathed-on car, your E55 in its current state of tune is unsuitable for such a mod. Its just going to be extremely loud and the lack of backpressure will probably lose you a little power (not a lot, maybe nothing, but I doubt it would give you any gains). As far as noise goes, take some baby steps. The headers will make it a bit louder and removing one set of cats will make it even more throaty, see how you like it in that state and if you're not satisfied then go for the gusto. A de-catted engine is a loud engine, a very loud engine indeed.
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MBWorld Fanatic!
Joined: Mar 2004
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From: South FL & NYC
Your worst nightmare...
Thanks for the advice guys....I will have to sit down with the person that is designing me the exhaust...One of the main reasons I just don't delete the 2 primary cats is not to butcher the stock system in case i want to just put it up and take it down for warranty reasons. I will see if perhaps we could modify or add some aftermarket cats, biturbo suggested some hi flow kleeman cats. will look into that.
Joined: Jul 2006
Posts: 6,760
Likes: 594
From: Seattle
'19 E63S, ‘16 CLS63 RIP, '09 E63 Gone, '06 M5 Gone, '97 Supra TT Gone
Thanks for the advice guys....I will have to sit down with the person that is designing me the exhaust...One of the main reasons I just don't delete the 2 primary cats is not to butcher the stock system in case i want to just put it up and take it down for warranty reasons. I will see if perhaps we could modify or add some aftermarket cats, biturbo suggested some hi flow kleeman cats. will look into that.
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
save some money and buy vrus' high flow cats...they're quite impressive and priced MUCH better!!!
here's a picture of victor's cats on my custom system:
here's a picture of victor's cats on my custom system:
MBWorld Fanatic!
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
Senior Member
Joined: Oct 2005
Posts: 315
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From: HOUSTON, TX
'06 CLS55 P030
Jody,
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
I removed my resonator, deleted the secondary cats, and modified the Rt. and Lft. muffler without any HP/TQ loss. Someday I need to post a sound clip of the way my beast roars. It is one of my favorite mods!
As for worrying about the ECU? I found a service advisor that works on my car with the mods and leaves the ECU alone. Matter of fact, I ran into an issue realated to some of the recall software being removed that caused my front battery to not recharge. The dealership did a custom reload to the ECU without changing the Powerchip software. It's all about building relationships. MB can do a million software updates and I will be OK.
