gasterus

Hi, the E60 545ci has the catalytic converter build into one unit with the exhaust manifold. There is no way a muffler shop can cut the catalytic section and join it with a straight pipe. Furthermore, there is a few of the lamba proxy wiring connected to the catalytic to send information to the DME unit. Your engine might not functioning properly if you bypass the catalytic converter. You can upgrade to Racing dynamic competition exhaust manifold and 100-cell catalytic converter, plus they will provide you with an upgraded DME maximized your engine performance along with the manifold&catalytic upgrade. Hope this helps

If you want a louder exhaust you can bypass the front and center muffler/resonator!

yo...selamat datang ke e60.net.

http://www.racdyn.com/Localized/Internatio...t_E60_Motor.htm
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Terima Kasih!

gasterus

The cat cons are part of the stock exhaust manifold on the six cylinder M54's at least. I don't think it will be that easy to simply cut these suckers off.

It'll probably be cheaper (and a lot more effective) to install a set of headers and race cats if you intend to return your car back to a stock condition before getting rid of it.

Apparently, all european ecu's from 2001 onwards are designed to work better with cats installed, so just tossing the cats on new cars actually has a deleterious effect on horsepower. torque and fuel consumption. That's why I'm getting the race cats put in to my headers as soon as HIOP releases them.
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Hello 6spdMan,

You are saying that you have an aftermarket header installed on your 530i without the catalytic converter? Can the engine operate normally in such manner, because from what I know BMW usually place a pair of oxygen sensor before and after the catalytic convertor, if this sensors are being plugged out I assume the DME will get confused. Please give me more info of your experience as I am also planning to upgrade my exhaust header on my 645ci, thanks

znod

Hi Jeffs:

I scanned what's above. But, did not see warranty mentioned. Are you concerned about your warranty? I would predict that if you do the things you are talking about that you will have warranty problems. I am going with no more than Dinan eventually offers and having my dealer, a Dinan certified shop, do the installation.

6spdMan

Singapore M54 3.0l engines only have pre-cat lambda/oxygen sensors, ie 1 pair not 2. Most other markets have both pre and post cat lambda sensors, so you're absolutely correct that you will have problems with the DME getting confused if the second pair of sensors is not properly installed.

If your V8 has pre and post cat sensors, then make sure you get race cats put in when you install your headers. V8 headers are gonna be extremely expensive, and take a lot longer to install than for 6 cylinder cars.

Good luck with your header install..

gasterus

Singapore M54 3.0l engines only have pre-cat lambda/oxygen sensors, ie 1 pair not 2. Most other markets have both pre and post cat lambda sensors, so you're absolutely correct that you will have problems with the DME getting confused if the second pair of sensors is not properly installed.

If your V8 has pre and post cat sensors, then make sure you get race cats put in when you install your headers. V8 headers are gonna be extremely expensive, and take a lot longer to install than for 6 cylinder cars.

Good luck with your header install..
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Thanks for the info 6spd I might consider trying out racing dynamics full exhaust system

JDN

Bottom line is that there is a beautiful V-8 note hidden somewhere in the 545 emission system that the Remus, B&B, SuperSprint, et al are not revealing. On my 540, that was cured when the exhaust system did its own disconnect behind the cats. Sounded great until I had to hook it up again. On the 545, I'm thinking the best option might be to go straight after the resonators. The resonators are needed to control the constant hum at high speeds. This should be a pretty simple fix for many muffler shops that can custom make a couple of pipes.

gasterus

There are 2 resonators(front and center) on 545i as well as 645ci. I have replaced the center resonator with a straight pipe and there is no changes to the character of the sound, sound level also remains the same. I have Eisenmann race muffler on my car, it sounds sportier than the stock muffler. But I dislike the throating sound the 645ci makes...it sounds like a old american V8. I do prefer the exhaust sound of the E39 540i, it has the trademark sound of a BMW V8.

I am considering either to have a header and catalytic upgrade from racing dynamics(claim 25hp increase but quite costly), or replace the front resonator with a straight pipe. Hopefully by changing the front resonator will eliminate the unpleasant sound of the throating exhaust. Somebody posted on the thread saying there is a exhaust valve on the front resonator that actually help to produce/control the throating sound, anyone has experience with this claim?

Has anyone tried the replacing all their resonators on 645ci/545i? I need more info on how they sound

Jeffs

Hi Jeffs:

I scanned what's above. But, did not see warranty mentioned. Are you concerned about your warranty? I would predict that if you do the things you are talking about that you will have warranty problems. I am going with no more than Dinan eventually offers and having my dealer, a Dinan certified shop, do the installation.
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Yes, I am worried about warranty as well. Good thing is I have a mechanic friend who does good work on my cars. I am still worrried though. But since the car has on supercharger, I hope the chances of engine blowout or failure will be smaller...

JDN

I'm pretty sure you will have a hum. I took the big one off and had a hum. IMO, you aren't going to go anywhere playing with just resonators.

gasterus

I'm pretty sure you will have a hum. I took the big one off and had a hum. IMO, you aren't going to go anywhere playing with just resonators.
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Ehm..so taking off the resonators just make additional hum...no change to the sound characteristic?

In that case, I have to seriously consider changing the headers and catalytic. Checkout the exhaust sound on this Racing dynamic 645ci. Its has a V12 engine a upgraded exhaust system I think it sound awesome! What do you guys thing?

Not sure that if my car will make the same noise after upgrading to your header and sport cats.

http://www.racdyn.com/Localized/Internatio...6_E63_Intro.htm