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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 02-02-2008, 09:11 PM   #1
GC540i

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Exclamation 540i exhaust

Can anybody tell me if removing the resonater off my e39 540i would cause any problems?
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Old 02-02-2008, 09:22 PM   #2
craig
 
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nope. shouldnt cause any problems, people remove it all the time with no reported problems.
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Old 02-05-2008, 08:15 PM   #3
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I haven't done it yet. But it will save you weight and give your car more a mean exhaust note.
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540i with some mods
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Old 06-03-2009, 09:47 AM   #4
FJD

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I heard a rumor that if you remove the resonators that you will loose some torque because you have less back pressure.Is this true ?
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Old 06-04-2009, 03:02 PM   #5
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Maybe, generally as long as you remove something AFTER the cat and O2 sensors you don't really affect anything that the car can't compensate for. If you're worried though get a replacement like a flowmaster, not the greatest performance muffler ever made but it maintains the back pressure needed and gives you a GREAT exhaust note.
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Old 06-10-2009, 02:27 PM   #6
devinwwu

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hack off the rear can right where it splits into the two chambers. One of them is closed and is designed to smooth out exhaust resonations, and the other is just the rear muffler with a turn down exit.

I cut it at the joint and angled my cut so the exhaust went towards the rear of the car. Without the muffler there it sounds great. The thing has to weigh at least 40 lbs and the car is not too loud at all without it. It is how the 540 should have sounded from the factory. very calm at idle and cruising, and a low muscle note through the lower rpms.

best part... $0 if you have your own sawzall... (Which I do)
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Old 06-10-2009, 10:32 PM   #7
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That trick also works on the inline 6 cyl's as well. Mellow throaty note at idle, still smooth and relatively quiet at cruise but when you stick your foot in it.....hell yeah. Not sure how they do it in S.A. but if your in an emission control zone in the U.S. you'd better have a replacement when it comes to inspection time. Otherwise....play ball
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Old 02-08-2012, 06:00 PM   #8
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I've got a 99 540i 6 speed. I cut the muffler off and added a piece of tail pipe to route it as stock. Very nice mellow gowl until about 3k then sounds as a European V-8 should. The bonus is a much stronger top end. Do not remove the resonator as it will be much louder and pop and backfire when decelerating. Total job cost was 70 USD for a muffler shop to add the tail piece.
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