Cats - how restrictive are they?
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E55
Very good point I think I might leave my secondary cats alone in order to prevent a CEL. If I replace the secondary cats with racing cats, I think it could increase the risk of getting the check engine light. As Chiromikey mentioned earlier, I think the true bottle neck is the location of the primary cats.
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E55K
YOU just need ot located O2 sensors as close a possible to Secondary Cats !!!
https://mbworld.org/forums/w211-amg/160072-removed-primary-cats-got-ses-lights.html
Be careful with O2 sesors and you should be fine...
Mike...
Have actually dynoed you car after you installed full exhaust system, what was your benefits ???
What diameteris your X-pipe, do you think it makes any power...I am starting to think or making X-pipe as well but keep th rest of exhaust stock ??? or I better do everything including the rest till the mufflers ???
Been told many times by Vadim and Cory and VRUS that E55 Exhaust is perfect and doesn need to changed, changing to diff config can only change SOUND and in the worst case loose power...
Last edited by E55 RUSS; Aug 22, 2007 at 07:57 AM.
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From: City with Tall buildings!
C43/55,2k11 Volvo S60 T6AWD,2k Audi B5 S4,95 Eagle Talon Tsi AWD 500+awhp
I plan on taking out the primary cats and replacing with straight pipes then moving the o2 sensor back behind secondary and replacing them with racing cats. Then pop out the resonator and replace with an x-pipe in my SLK. That should give me some nice gains, and the weight savings will be nice as the SLK isn't as heavy as the E to begin with so it should be more noticable. Then put a set of underdrive pulleys on it and it should have a lot more pep.
What do you guys think? Sound good? Shouldn't be more than $1200 together.
If I can squeeze even 20-25 rwhp out if it I'll be happy and much cheaper than other options like $5000 headers or $1000 ecu that adds 8hp. The extra growl will be nice to.
What do you guys think? Sound good? Shouldn't be more than $1200 together.
If I can squeeze even 20-25 rwhp out if it I'll be happy and much cheaper than other options like $5000 headers or $1000 ecu that adds 8hp. The extra growl will be nice to.
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E55
I plan on taking out the primary cats and replacing with straight pipes then moving the o2 sensor back behind secondary and replacing them with racing cats. Then pop out the resonator and replace with an x-pipe in my SLK. That should give me some nice gains, and the weight savings will be nice as the SLK isn't as heavy as the E to begin with so it should be more noticable. Then put a set of underdrive pulleys on it and it should have a lot more pep.
What do you guys think? Sound good? Shouldn't be more than $1200 together.
If I can squeeze even 20-25 rwhp out if it I'll be happy and much cheaper than other options like $5000 headers or $1000 ecu that adds 8hp. The extra growl will be nice to.
What do you guys think? Sound good? Shouldn't be more than $1200 together.
If I can squeeze even 20-25 rwhp out if it I'll be happy and much cheaper than other options like $5000 headers or $1000 ecu that adds 8hp. The extra growl will be nice to.
http://www.supersprintna.com/product...arch_model/221
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From: City with Tall buildings!
C43/55,2k11 Volvo S60 T6AWD,2k Audi B5 S4,95 Eagle Talon Tsi AWD 500+awhp
Very good point I think I might leave my secondary cats alone in order to prevent a CEL. If I replace the secondary cats with racing cats, I think it could increase the risk of getting the check engine light. As Chiromikey mentioned earlier, I think the true bottle neck is the location of the primary cats.
Remember don't put aanything else but stainless steel parts on your AMG exhaust(cats,reso's,pipes), great advice from Alfee and this is what MB uses stck.4000 lb car will definitely benefit from whatever weight loss you give it. That's why we pull things like the spare tire,jack,seats and whatever we need to get the best 1/4 mile times at the track. To decrease weight.
Last edited by ProjectC55; Aug 22, 2007 at 08:07 AM.
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E55K
O2 sensors need HEAT !!! If there is enough HEAT from 400 cell Cats, then there more then enough HEAT from 200 Cell CATS...
It will work...proper installation and wiring is the KEY !!!
It will work...proper installation and wiring is the KEY !!!
Last edited by E55 RUSS; Aug 22, 2007 at 08:28 AM.
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E55
Ok. I think you guys have convinced me.. No cutting corners. Drop in a new exhaust system from headers back. I think I would like to pre and post dyno my car to see the benefits. As well as take it to the track. This is going to be interesting. I am predicting 5-10 extra rwhp above simply gutting out my cats and maybe .1 decrease in ETs from the extra hp and weight savings. Anyone on this board tested this yet?
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From: City with Tall buildings!
C43/55,2k11 Volvo S60 T6AWD,2k Audi B5 S4,95 Eagle Talon Tsi AWD 500+awhp
That is exactly what I'm saying. If the O2 sensors don't reach a certain temp,(car running too rich or def sensor) the CEL light will come on.
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E55K
Ok. I think you guys have convinced me.. No cutting corners. Drop in a new exhaust system from headers back. I think I would like to pre and post dyno my car to see the benefits. As well as take it to the track. This is going to be interesting. I am predicting 5-10 extra rwhp above simply gutting out my cats and maybe .1 decrease in ETs from the extra hp and weight savings. Anyone on this board tested this yet?
Last edited by E55 RUSS; Aug 22, 2007 at 01:18 PM.
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E55
How much more hp and how much quicker in the 1/4 mile do you think it will be?
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SL65
I assume that replacing the resonator with an X-pipe is what will create the extra hp because I don't think the resonator is restrictive at all. Have you seem Supersprint's X-pipe resonator.
http://www.supersprintna.com/product...arch_model/221
http://www.supersprintna.com/product...arch_model/221
http://www.supersprintna.com/product...arch_model/302
Last edited by bfnnrgn; Aug 22, 2007 at 12:07 PM.
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2004 MB E55 AMG, 2006 Audi A6 4.2, 2008 WRX STI
Very good point I think I might leave my secondary cats alone in order to prevent a CEL. If I replace the secondary cats with racing cats, I think it could increase the risk of getting the check engine light. As Chiromikey mentioned earlier, I think the true bottle neck is the location of the primary cats.
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E55
Warning
Just had a conversation with Brandon at Kleemann. He mentioned something to me that I was unware of. Not only do we need to be concerned about the check engine light to pass inspection but we should also be concerned about OBDII readiness probing. It seems that some states only do OBDII readiness probing. By simply moving the distance of your O2 sensors you can trigger an OBDII readiness fault without triggering a CEL and you will FAIL INSPECTION.
Brandon is extremely knowledgeable and I highly recommend speaking to him before doing any exhaust work.
Brandon is extremely knowledgeable and I highly recommend speaking to him before doing any exhaust work.
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E55
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E55K
You will definately feel more snap with PRIMARY Cats removed but I doubt thaat you would make any more power with the rest of the exhausts....
Last edited by E55 RUSS; Aug 23, 2007 at 06:52 AM.
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E55
My second dilemna is that I have renntech headers. Similiar to Evosport headers, these headers connect to the stock downpipes which is 47mm wide. These downpipes connect to the primary cats, and it isn't until after the primary cats that the piping expands to 70 or 74mm. Hence the bottleneck isnt just the primary cats. It is also the 47mm piping from my headers to the cats. How do I solve this issue without getting new headers?
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haters crazy
Why dont you guys just delete the primary cat and get an electronic cutout after the secondary to bipass the rest of the exhaust. Go back to quiet with the switch of a button. Electronic cutout is less than $300
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E55
I dont think this will increase horsepower, only noise..
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
Just had a conversation with Brandon at Kleemann. He mentioned something to me that I was unware of. Not only do we need to be concerned about the check engine light to pass inspection but we should also be concerned about OBDII readiness probing. It seems that some states only do OBDII readiness probing. By simply moving the distance of your O2 sensors you can trigger an OBDII readiness fault without triggering a CEL and you will FAIL INSPECTION.
Brandon is extremely knowledgeable and I highly recommend speaking to him before doing any exhaust work.
Brandon is extremely knowledgeable and I highly recommend speaking to him before doing any exhaust work.
the resonator is heavy but not anywhere near 70lbs...probably more like 25. i don't see any reason to replace the resonator with supersprints overpriced version or their overpriced x-pipe. a good fabricator can make a better one or get a burns unit. an x-pipe should merge gasses into a tight area, forcing the gasses to increase their velocity, and spit them back out the other side to aid in scavenging. an x-pipe resonator will NOT perform that task. imho, the only thing nice about ss's products are the fact that they're pretty...something which you'll never enjoy after you get them installed.
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haters crazy
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
that is what I am thinking as well. Modding anything from the cats back I think we yield minimal performance enhancement.
My second dilemna is that I have renntech headers. Similiar to Evosport headers, these headers connect to the stock downpipes which is 47mm wide. These downpipes connect to the primary cats, and it isn't until after the primary cats that the piping expands to 70 or 74mm. Hence the bottleneck isnt just the primary cats. It is also the 47mm piping from my headers to the cats. How do I solve this issue without getting new headers?
My second dilemna is that I have renntech headers. Similiar to Evosport headers, these headers connect to the stock downpipes which is 47mm wide. These downpipes connect to the primary cats, and it isn't until after the primary cats that the piping expands to 70 or 74mm. Hence the bottleneck isnt just the primary cats. It is also the 47mm piping from my headers to the cats. How do I solve this issue without getting new headers?
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
sleeper's right...i've never seen an application where the electronic cutouts have made hp, just noise. that could be because they're almost exclusively bolted on a system that wasn't tuned to run open headers but that's still my experience.
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Ha ha ha, I called a local shop to see if they would install what I wanted. Underdrive pulleys, cats, xpipe. They said nah, that's not a good idea, here buy these kleemann headers instead...
