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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 09-09-2012, 05:17 PM
e39540iv8 e39540iv8 is offline
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540i Muffler Delete

OK so I'm dug around the forum a bit on this but no definite answer. If I do a muffler delete will the car actually lose power or/and torque like some say, if so why. I mean removing the muffler isn't going to create back pressure and contrary to belief back pressure does not help engines so what gives, just a myth or fact?
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  #2  
Old 09-09-2012, 07:28 PM
markg540i markg540i is offline
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Mein Auto: 2000 540i
Muffler Delete

When I did mine it felt like it gained some power but I think it was because of the awesome sound it produced.
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  #3  
Old 09-09-2012, 08:03 PM
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collardgreens collardgreens is offline
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my muffler fell off my oldsmobile and it felt like it gained 15 hp, i didnt want to fix it!
chop it off!
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  #4  
Old 09-09-2012, 08:26 PM
borahatch borahatch is offline
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I noticed absolutely zero difference in power after I had my muffler deleted.

Quote:
Originally Posted by e39540iv8 View Post
OK so I'm dug around the forum a bit on this but no definite answer. If I do a muffler delete will the car actually lose power or/and torque like some say, if so why. I mean removing the muffler isn't going to create back pressure and contrary to belief back pressure does not help engines so what gives, just a myth or fact?
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  #5  
Old 09-10-2012, 04:25 PM
e39540iv8 e39540iv8 is offline
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But no lose of power right. I know that running a straight pipe from the headers and increasing the diameter might make the vacuum effect less but I'm not even touching the cats or anything before. Just those big cans all the way at the back. Also what if I remove one of them only. I just wanna get rid of one so when I fit the M tech bumper I can have an exhaust pipe coming of the place for it.
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  #6  
Old 09-10-2012, 04:29 PM
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bricas45 bricas45 is offline
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You will not loose power it is a myth.

The more you make the exhaust flow...the more power you will gain. A true dual can hurt performance but something like an H, X or Y pipe will benefit.

Obviously if you delete everything like headers and all yeah you will see power loss. You can really really improve these exhaust systems though they are bottle neck for the cars.
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2001 540i - Orient Blue

M5 bumpers, wheels, mirrors
S/C, water/air IC
A1 Headers, Random Technology Cats, Eissenmann Exhaust
3.15 diff, evosport power pullies
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Last edited by bricas45; 09-10-2012 at 04:39 PM.
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  #7  
Old 09-10-2012, 08:34 PM
GreenTiger GreenTiger is offline
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Quote:
Originally Posted by bricas45 View Post
You will not loose power it is a myth.

The more you make the exhaust flow...the more power you will gain. A true dual can hurt performance but something like an H, X or Y pipe will benefit.

Obviously if you delete everything like headers and all yeah you will see power loss. You can really really improve these exhaust systems though they are bottle neck for the cars.
I agree bricas...but I never understood this:

Obviously if you delete everything like headers and all yeah you will see power loss.

I know that faster exhaust flow equals higher power, but what about those drag race cars that just have 8-12inch mandrel piping as headers?

To answer OP's question: Anything deleted after the cats won't cause a loss of power in the E39. Before the cats is up for debate.
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  #8  
Old 09-10-2012, 09:07 PM
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bricas45 bricas45 is offline
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An exhaust system acts like a filter. The bigger you make it and better it flows at high rpm, but there is a limit before you run into issues at low rpm and starting. I have high flow mandrel bent stepped headers on my 540 with racing 100 cell cats to 3" stainless all the way back...I saw pretty large gains with these on the order of 21rwhp of gain and about 18rw ft-lbs.

I was referring to just open exhaust ports that would be the extreme and you would have issues running at low rpm and issues starting...you need some back pressure.

More back pressure helps at low rpm... Low pressure helps at higher rpm. Stepped headers are designed to be broader band...and 4-2-1 equal length stepped headers would be the broadest band working best at all rpms. Only one that sells those is Dinan and they are 8k!!!! The leading small tubes give you the pressure you need for low rpm and then they progressively get larger which allow the higher flow at high rpm.

These cars can be really really loud haha
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2001 540i - Orient Blue

M5 bumpers, wheels, mirrors
S/C, water/air IC
A1 Headers, Random Technology Cats, Eissenmann Exhaust
3.15 diff, evosport power pullies
Koni Sports, Eibach Springs/Sway Bars

Last edited by bricas45; 09-10-2012 at 09:13 PM.
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  #9  
Old 09-11-2012, 12:03 AM
GreenTiger GreenTiger is offline
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Are your A1 headers 4-2-1 stepped headers? If so, how much did you pay for them, if you don't mind me asking?

What do you think about the schmiedmann headers or the supersprint headers?

BTW, by any chance would you know the cell count of the OEM cats on the 540i, how about the popular magnaflow prevanos CA carb certified cats?

Last edited by GreenTiger; 09-11-2012 at 12:04 AM.
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  #10  
Old 09-11-2012, 02:33 AM
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bricas45 bricas45 is offline
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Quote:
Originally Posted by King540i View Post
Are your A1 headers 4-2-1 stepped headers? If so, how much did you pay for them, if you don't mind me asking?

What do you think about the schmiedmann headers or the supersprint headers?

BTW, by any chance would you know the cell count of the OEM cats on the 540i, how about the popular magnaflow prevanos CA carb certified cats?
No mine are not 4-2-1 the A1s are 4-1 stepped headers. The A1s were $1275. The A1s are a very similar design to the supersprints (also 4-1) but are each a solid header ad therefore no spring collector device on the A1s. This makes them harder to install unfortunately.

I don't know the schmiedmann headers. The supersprints are ok. They are easier to install than others with the separate tubes but I hear the spring loaded collectors can start to leak.

The cell count of the stock cats are 800 cell and on the vanos motors there are 2 per bank. I am not too sure about the CARB certified cats and what they are.
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2001 540i - Orient Blue

M5 bumpers, wheels, mirrors
S/C, water/air IC
A1 Headers, Random Technology Cats, Eissenmann Exhaust
3.15 diff, evosport power pullies
Koni Sports, Eibach Springs/Sway Bars

Last edited by bricas45; 09-11-2012 at 09:22 AM.
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  #11  
Old 09-11-2012, 08:31 AM
Sashajoi22 Sashajoi22 is offline
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Mein Auto: E39 wagon
E39 wagon.Chopped mine off last week. Sounds great and I dont know but it feels like it gained power not like a crazy amount but anytime the car loses weight its going to do better. My mpg also seems normal
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  #12  
Old 09-11-2012, 12:36 PM
Bandem Bandem is offline
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So if you chop a muffler off, JUST the muffler that's near the back end and NOT touch anything else (leave the resonators alone and such), will you lose a noticeable (or if any) amount of low rpm torque? Basically, same question as the OP. I am asking regarding any E39...525i all the way to M5.

Last edited by Bandem; 09-11-2012 at 02:53 PM.
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  #13  
Old 09-11-2012, 04:00 PM
GreenTiger GreenTiger is offline
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Quote:
Originally Posted by Bandem View Post
So if you chop a muffler off, JUST the muffler that's near the back end and NOT touch anything else (leave the resonators alone and such), will you lose a noticeable (or if any) amount of low rpm torque? Basically, same question as the OP. I am asking regarding any E39...525i all the way to M5.
No power loss. You actually might gain a few horses and have a nicer sound.
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  #14  
Old 09-13-2012, 02:02 AM
poormansM5 poormansM5 is offline
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Minimal loss or gains to even notice with just a muffler delete. Ridding the car of both the mufflers and Y resonator should free up a considerable amount of weight though. That might be the best reason to do it, not to mention the amazing exhaust tone!
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  #15  
Old 09-13-2012, 06:33 AM
00540i6 00540i6 is offline
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You won't lose power I first had my resonator deleted then the rear silencer an had it like that for a couple months. But know I straight piped it from the resonator delet back to this. And I used all stainless the tips are 24inch long blast pipe style it gives it a crazy sound still all 2.5 inch pipe an no lose of power
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  #16  
Old 09-13-2012, 10:57 AM
4given 4given is offline
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Has anyone done a side exit exhaust? I have that done to my 1996 cobra because of all the suspension stuff done to it. I thought it would be cool to do that to my 540 as well.
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  #17  
Old 09-13-2012, 11:13 AM
poormansM5 poormansM5 is offline
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Quote:
Originally Posted by 00540i6 View Post
You won't lose power I first had my resonator deleted then the rear silencer an had it like that for a couple months. But know I straight piped it from the resonator delet back to this. And I used all stainless the tips are 24inch long blast pipe style it gives it a crazy sound still all 2.5 inch pipe an no lose of power
Loving the look! I have a guy at the local muffler shop ready to do this for me this week... cant wait!
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  #18  
Old 09-13-2012, 12:40 PM
00540i6 00540i6 is offline
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I thought I was the only person that would want blast pipes on a 540i lol one more added to the crew
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  #19  
Old 09-13-2012, 01:48 PM
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the540wgn the540wgn is offline
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lol just found this
http://www.youtube.com/watch?feature...&v=w1bh1HCEeEQ
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  #20  
Old 09-13-2012, 02:53 PM
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bricas45 bricas45 is offline
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mine's pretty loud, no muffler delete though!
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2001 540i - Orient Blue

M5 bumpers, wheels, mirrors
S/C, water/air IC
A1 Headers, Random Technology Cats, Eissenmann Exhaust
3.15 diff, evosport power pullies
Koni Sports, Eibach Springs/Sway Bars

Last edited by bricas45; 09-13-2012 at 02:55 PM.
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  #21  
Old 09-13-2012, 08:24 PM
Bandem Bandem is offline
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I wish there was an easy way to make an rpm based silencer activation system. What I mean is that, I want the car to be quiet during daily driving which takes place below 3-4k rpm and if I take it past that, it activates a valve that bypasses the silencer/resonator to make it louder. I know corvettes have something similar to this. I've driven the grand sport. Quiet as a sleeping volcano below 3k, and deafeningly loud past that.
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  #22  
Old 09-13-2012, 09:35 PM
4given 4given is offline
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You could always have an electric cutout welded in.
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  #23  
Old 09-14-2012, 04:11 PM
e39540iv8 e39540iv8 is offline
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OK guys so I have 2 cans at the back right behind the bumper, do they both go or.....?
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  #24  
Old 09-14-2012, 04:38 PM
poormansM5 poormansM5 is offline
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Quote:
Originally Posted by e39540iv8 View Post
OK guys so I have 2 cans at the back right behind the bumper, do they both go or.....?
Yes. Good riddance! those things are HEAVY!
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Old 09-14-2012, 04:41 PM
poormansM5 poormansM5 is offline
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This is where I saw best to cut in order to weld a temporary downturn until I get around to the full Y delete & custom piping.

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