Stock E63 exhaust minus resonator and/or muffler?
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Senior Member
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From: San Diego
2007 E63 AMG
Stock E63 exhaust minus resonator and/or muffler?
I've done quite a bit of researching in regards how to get my E63 exhaust louder. I'm not looking to get any aftermarket exhaust right now. So, here are the five options I would like to present to the 63 experts. 
1. Deleted secondary cats and resonator, replace with straight pipes
2. Deleted secondary cats and resonator, replace with x-pipe
3. Delete resonator, replace with straight pipes
4. Delete resonator, replace with x-pipe
5. Delete mufflers, replace with straight pipes
Which of these five options would give a more meaner sounding exhaust yet not lose any low-end torque? TIA.
1. Deleted secondary cats and resonator, replace with straight pipes
2. Deleted secondary cats and resonator, replace with x-pipe
3. Delete resonator, replace with straight pipes
4. Delete resonator, replace with x-pipe
5. Delete mufflers, replace with straight pipes
Which of these five options would give a more meaner sounding exhaust yet not lose any low-end torque? TIA.
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Joined: Jan 2007
Posts: 846
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From: da long island
1989 Toyota Tercel Coupé
i think this was sec cats res replaced with straight pipes
http://www.youtube.com/watch?v=5OcZKde2khs
http://www.youtube.com/watch?v=5OcZKde2khs
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From: So Cal
i think this was sec cats res replaced with straight pipes
http://www.youtube.com/watch?v=5OcZKde2khs
http://www.youtube.com/watch?v=5OcZKde2khs
Super Member
Joined: Jan 2007
Posts: 846
Likes: 1
From: da long island
1989 Toyota Tercel Coupé
for sound it seems like it. this one is the same car but just the resonator removed. http://youtube.com/watch?v=QR9jFZA71ig
sec cats and resonator is what I'm doing to my car soon.
sec cats and resonator is what I'm doing to my car soon.
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Joined: Jan 2007
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09 335i 03 CLK55 AMG
I've done quite a bit of researching in regards how to get my E63 exhaust louder. I'm not looking to get any aftermarket exhaust right now. So, here are the five options I would like to present to the 63 experts.
1. Deleted secondary cats and resonator, replace with straight pipes
2. Deleted secondary cats and resonator, replace with x-pipe
3. Delete resonator, replace with straight pipes
4. Delete resonator, replace with x-pipe
5. Delete mufflers, replace with straight pipes
Which of these five options would give a more meaner sounding exhaust yet not lose any low-end torque? TIA.
1. Deleted secondary cats and resonator, replace with straight pipes
2. Deleted secondary cats and resonator, replace with x-pipe
3. Delete resonator, replace with straight pipes
4. Delete resonator, replace with x-pipe
5. Delete mufflers, replace with straight pipes
Which of these five options would give a more meaner sounding exhaust yet not lose any low-end torque? TIA.
Do the secondary cats delete if they have no o2 sensors and resonator delete and replace with straight pipes...I did that on my C43 and the sound is unbelieveable. When the car cold starts in the morning, I sit at the back of the car and listen until it goes away hahaha. Was a good 20lb weight reduction on my car as well.
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From: San Diego
2007 E63 AMG
I have heard and read that deleting both the secondary cats and resonator and replacing with straight pipes will cause a loss of low-end torque. It's best to use a crossover, either a H-pipe or X-pipe. I'm inclined to use the x-pipe but I've seen the underside of the CLK63 Black Series and it looks like a H-pipe is being used.
Why Use a Crossover?
The primary function of a crossover is to equalize the flow of exhaust gas between each side of a dual exhaust system. By equalizing the flow between the pipes, the exhaust system can remove exhaust gas from the engine more efficiently. Exhaust pulses between opposing cylinder banks are smoothed out as well. The net result is a more efficient scavenging of exhaust gas from the cylinder heads, which pulls a fresh air/fuel charge into the engine quicker. And that means more power.
Crossovers come in two flavors. The H-pipe, or balance tube, connects each side of a dual exhaust system with a straight piece of tubing. This allows exhaust gas to move between the pipes, equalizing flow and backpressure between the two sides of the system.
The other type of crossover is the X-pipe. Instead of using a straight cross-tube to connect each side of the exhaust system, the X-pipe literally allows each side to cross over to the other. The advantages of the X-pipe include better exhaust scavenging and improved exhaust flow balance between the pipes.
The primary function of a crossover is to equalize the flow of exhaust gas between each side of a dual exhaust system. By equalizing the flow between the pipes, the exhaust system can remove exhaust gas from the engine more efficiently. Exhaust pulses between opposing cylinder banks are smoothed out as well. The net result is a more efficient scavenging of exhaust gas from the cylinder heads, which pulls a fresh air/fuel charge into the engine quicker. And that means more power.
Crossovers come in two flavors. The H-pipe, or balance tube, connects each side of a dual exhaust system with a straight piece of tubing. This allows exhaust gas to move between the pipes, equalizing flow and backpressure between the two sides of the system.
The other type of crossover is the X-pipe. Instead of using a straight cross-tube to connect each side of the exhaust system, the X-pipe literally allows each side to cross over to the other. The advantages of the X-pipe include better exhaust scavenging and improved exhaust flow balance between the pipes.
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Joined: Nov 2006
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From: North Carolina
E63
Selling me E63 for $ 73K if any ones looking
About 5500 miles.
Iridium silver
Premium II package. No pano.
Parktronic
Eiseman street exhaust, with the old mufflers and resonator.
Tinted windows.
Never driven in the rain. Garaged and flawless.
I will tey and find the sticker to see what all it has.
I don't drive it enough to justify keeping it. Incredible car.
I thought I would give some one on this board the first shot at it.
Iridium silver
Premium II package. No pano.
Parktronic
Eiseman street exhaust, with the old mufflers and resonator.
Tinted windows.
Never driven in the rain. Garaged and flawless.
I will tey and find the sticker to see what all it has.
I don't drive it enough to justify keeping it. Incredible car.
I thought I would give some one on this board the first shot at it.
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Thread Starter
Senior Member
Joined: Nov 2006
Posts: 284
Likes: 0
From: San Diego
2007 E63 AMG
About 5500 miles.
Iridium silver
Premium II package. No pano.
Parktronic
Eiseman street exhaust, with the old mufflers and resonator.
Tinted windows.
Never driven in the rain. Garaged and flawless.
I will tey and find the sticker to see what all it has.
I don't drive it enough to justify keeping it. Incredible car.
I thought I would give some one on this board the first shot at it.
Iridium silver
Premium II package. No pano.
Parktronic
Eiseman street exhaust, with the old mufflers and resonator.
Tinted windows.
Never driven in the rain. Garaged and flawless.
I will tey and find the sticker to see what all it has.
I don't drive it enough to justify keeping it. Incredible car.
I thought I would give some one on this board the first shot at it.
Sounds good! And I'll replace the resonator with a x-pipe.
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Posts: 13,394
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From: San Diego
2015 S212
Thread Starter
Senior Member
Joined: Nov 2006
Posts: 284
Likes: 0
From: San Diego
2007 E63 AMG
^
It's my understanding that a x-pipe serves two purposes. It helps maintain low-end torque and keeps the droning down inside the cabin whereas running straight pipes without any crossover (h or x-pipe) will cause the opposite effect. Here's an excerpt I found why a x-pipe is preferred.
It's my understanding that a x-pipe serves two purposes. It helps maintain low-end torque and keeps the droning down inside the cabin whereas running straight pipes without any crossover (h or x-pipe) will cause the opposite effect. Here's an excerpt I found why a x-pipe is preferred.
Why X over H?
It has been proven time and again that the X-pipe design is more efficient than the H-pipe. Various tests have shown that for multiple cylinder engines the X-pipe outperforms H-pipe exhaust systems, especially as rpm increases, providing both better torque and power. Unified exhaust pipes work most efficiently with multiple cylinders because of the scavenging effect. With exhaust X-pipes the almost seamless connection between the two exhaust pipes allows sequential firing cylinders to salvage any spent exhaust gases from the combustion chamber more efficiently and creates more room in the cylinder for a fresh intake of undiluted fuel and air. When you have two exhaust pipes, as the velocity in one header tube increases, the pressure in the adjacent tube is lowered causing the exhaust to be sucked out of that cylinder. X-pipes are simply better at doing the job, especially at higher speeds.
It has been proven time and again that the X-pipe design is more efficient than the H-pipe. Various tests have shown that for multiple cylinder engines the X-pipe outperforms H-pipe exhaust systems, especially as rpm increases, providing both better torque and power. Unified exhaust pipes work most efficiently with multiple cylinders because of the scavenging effect. With exhaust X-pipes the almost seamless connection between the two exhaust pipes allows sequential firing cylinders to salvage any spent exhaust gases from the combustion chamber more efficiently and creates more room in the cylinder for a fresh intake of undiluted fuel and air. When you have two exhaust pipes, as the velocity in one header tube increases, the pressure in the adjacent tube is lowered causing the exhaust to be sucked out of that cylinder. X-pipes are simply better at doing the job, especially at higher speeds.
Out Of Control!!
Joined: Sep 2004
Posts: 13,394
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From: San Diego
2015 S212
I'm not going to argue posts but to say that any good exhaust setup is a properly tuned one. As with any fine thing in life, there are no absolutes. Also, keep in mind that you have a naturally aspirated motor with high compression. On the E55s (like mine) backpressure is an issue and that is where the options of X and H pipes come in. Here is what i believe on both your issues:
Droning:
If you straight pipe them, you will be able to hear distinctive tones from the left vs right banks. I actually like the sound, but a crossover will solve that. Now, what kind of crossover? An X or an H? and where do you place it? An X will force the most mixing of the two banks. An H setup will have the majority channel through its own pipe and only crosspressures get normalized.
Backpressure: Again, I don't think you want it, but here is my take anyhow. It is true that the E55s lose low end if you open the exhaust too much. That is where tuning comes into play. the current pipes are simply too wide for what power it currently puts out IF you are going to cut out the main sources of backpressure (cats, resonators, mufflers). In the case of the E55, the main contributor to backpressure is the cats. My car actually felt faster without the resonators. Some like to remove all the other stuff, but end up having to add backpressure (restriction) just to have the car run right. That is where the X pipe comes in. It basically makes a clog up in the system, so that what happens after the x is irrelevent. That is why i do not like it.
Hope that helps. My personal preference will be to have new pipes made front to rear. I wonder if 2.5 inchers would do me right without any cats or muffler?
Point:
Droning:
If you straight pipe them, you will be able to hear distinctive tones from the left vs right banks. I actually like the sound, but a crossover will solve that. Now, what kind of crossover? An X or an H? and where do you place it? An X will force the most mixing of the two banks. An H setup will have the majority channel through its own pipe and only crosspressures get normalized.
Backpressure: Again, I don't think you want it, but here is my take anyhow. It is true that the E55s lose low end if you open the exhaust too much. That is where tuning comes into play. the current pipes are simply too wide for what power it currently puts out IF you are going to cut out the main sources of backpressure (cats, resonators, mufflers). In the case of the E55, the main contributor to backpressure is the cats. My car actually felt faster without the resonators. Some like to remove all the other stuff, but end up having to add backpressure (restriction) just to have the car run right. That is where the X pipe comes in. It basically makes a clog up in the system, so that what happens after the x is irrelevent. That is why i do not like it.
Hope that helps. My personal preference will be to have new pipes made front to rear. I wonder if 2.5 inchers would do me right without any cats or muffler?
Point:
Thread Starter
Senior Member
Joined: Nov 2006
Posts: 284
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From: San Diego
2007 E63 AMG
I'm by no means an expert on exhaust system set up. That's is why I'm happy to hear from people about their experience and opinions. I have heard from a tuning shop that I frequent, Sonic MS in Santa Clara, that they had a customer who happened to be a member here, Mogz if I recall, that has a 2007 E63 who removed his secondary cats and resonators and went straight pipes. He noticed a loss in low-end power and eventually went and put everything back on. This is what was told to me by the owner of Sonic MS.
So, you can see my hesitancy of going with straight pipes. I had a good experience with a cat-back free flow exhaust system from my previous BMW 545i which had a CAI, remapped ECU, x-pipe, dual silencers (mufflers), and quad tips. I'm thinking I can use almost the same setup with the E63 since it's a NA engine like the 545i was. After the exhaust work, I'll be looking to replace the stock filter and remap the ECU.
What I should really do is dyno my car before modding the exhaust. That way I'll have a baseline to know whether straight pipes, H-pipes or X-pipes is the way to go with the 63 engine. Time to look for a dyno shop in San Jose.
ps.
I'd like to meet up with you to talk about our cars and maybe do a few highway rolls once I get back to San Diego which might be in a few weeks if I don't find a new assignment in the Bay Area.
So, you can see my hesitancy of going with straight pipes. I had a good experience with a cat-back free flow exhaust system from my previous BMW 545i which had a CAI, remapped ECU, x-pipe, dual silencers (mufflers), and quad tips. I'm thinking I can use almost the same setup with the E63 since it's a NA engine like the 545i was. After the exhaust work, I'll be looking to replace the stock filter and remap the ECU.
What I should really do is dyno my car before modding the exhaust. That way I'll have a baseline to know whether straight pipes, H-pipes or X-pipes is the way to go with the 63 engine. Time to look for a dyno shop in San Jose.
ps.
I'd like to meet up with you to talk about our cars and maybe do a few highway rolls once I get back to San Diego which might be in a few weeks if I don't find a new assignment in the Bay Area.
Last edited by vegastrashed; Sep 17, 2007 at 07:02 PM.
Out Of Control!!
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From: San Diego
2015 S212
What I should really do is dyno my car before modding the exhaust. That way I'll have a baseline to know whether straight pipes, H-pipes or X-pipes is the way to go with the 63 engine. Time to look for a dyno shop in San Jose.
ps.
I'd like to meet up with you to talk about our cars and maybe do a few highway rolls once I get back to San Diego which might be in a few weeks if I don't find a new assignment in the Bay Area.
ps.
I'd like to meet up with you to talk about our cars and maybe do a few highway rolls once I get back to San Diego which might be in a few weeks if I don't find a new assignment in the Bay Area.
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From: Southern California
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hate to bring up an old thread but if i were to get rid of the secondary cats and replace them with a straight pipe, would there be any error messages coming up? also where can i get a straight pipe specifically for an E63 from? thanks
Out Of Control!!
Joined: Sep 2004
Posts: 13,394
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From: San Diego
2015 S212
You will not get an error message from taking off the secondary cats. You get the tubing at a muffler shop. A good one will be able to make the piece and bend the tubing to match. I am very interested in the gains that can be had with exhaust and ecu only on the E63s. I don't think MB tuned it to the block's potential because of the other concerns (tranny, etc.). There is no reason why a 6.3 shouldn't be able to spank a 5.5 (given 55s are SC'd).
Soundwise, the E63 sounds like a true muscle car to me with just the resonators deleted. i dunno if it adds any performance, but it sounds AWESOME!
Soundwise, the E63 sounds like a true muscle car to me with just the resonators deleted. i dunno if it adds any performance, but it sounds AWESOME!
