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post #1 of 10 Old 22nd February 2012, 08:31 AM Thread Starter
lehsmann
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Yet another Cheap exhaust mod

Hi guys,i came across a very simple yet glorious sounding exhaust mod while playing around with my car,i cut 4 square openings(about 10cm by 10cm)on all four rear cans and removed the silencer material,then i closed the openings with some mesh wire,the resulting sound is toxic,at startup and idle its very deep and bubbly but as you pick the revs it changes to a high pitched wail.I have headers,decats,oem h-pipe and oem resonator,Picture is shown below.For those of you who have spare oem cans lying around you better try this!

What i want to know is that does this have any negative impact on the Engine,Power and fuel economy?

Yet another Cheap exhaust mod-picture-194.jpg

Yet another Cheap exhaust mod-picture-193.jpg

2000 E39 M5 Oxford Green Metallic(DD)

Evolve AlphaN
Evolve Power Tune
Evolve Headers
Evolve IATS
Decatted OEM Exhaust
6000K Angel Eyes
6000K Fog Lights
6000K Low and High Beam

Wanted:Lower Oil Pan(even with stripped bolt threads is ok),DSC Control Module/ABS unit

1988 E30 325i Coupe White(Weekend Toy)
E34 535i Drivetrain
Express Works Suspension
Custom Exhaust
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post #2 of 10 Old 22nd February 2012, 09:18 AM
Leezamonkey
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I do have my originals laying about and would love to have tried this a couple of years ago before I got my H&S but didn't feel that hacking away at a car like this to be appropriate!

Still well done for trying it but I dare say there is some back pressure lost by doing that, maybe no worse than straight pipes tho?

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post #3 of 10 Old 22nd February 2012, 09:36 AM Thread Starter
lehsmann
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Quote:
Originally Posted by Leezamonkey View Post

Still well done for trying it but I dare say there is some back pressure lost by doing that, maybe no worse than straight pipes tho?
Thats what im worried about,does that mean negative impact on the engine,coz i wouldnt wanna put my engine at risk,thats why i asked you guys!

2000 E39 M5 Oxford Green Metallic(DD)

Evolve AlphaN
Evolve Power Tune
Evolve Headers
Evolve IATS
Decatted OEM Exhaust
6000K Angel Eyes
6000K Fog Lights
6000K Low and High Beam

Wanted:Lower Oil Pan(even with stripped bolt threads is ok),DSC Control Module/ABS unit

1988 E30 325i Coupe White(Weekend Toy)
E34 535i Drivetrain
Express Works Suspension
Custom Exhaust
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post #4 of 10 Old 22nd February 2012, 09:41 AM
Leezamonkey
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I'm really not that clever! Just feel that maybe taking the baffles out I the cans opened it up to straight pipe dimensions, and now you have opened them up further, I think its low end power more than anything that it will affect, as I said I'm not that clever ill leave it to someone else to rectify my wrongness!

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post #5 of 10 Old 22nd February 2012, 11:15 AM
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No different than straight pipes. No negative effect on "back pressure" at all.



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///
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Last edited by timmay77; 22nd February 2012 at 11:15 AM.
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post #6 of 10 Old 22nd February 2012, 02:19 PM
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How 'bout a video of the sound?

One thing I would do is spray the mesh with grill paint to prevent the rust.
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post #7 of 10 Old 22nd February 2012, 03:11 PM Thread Starter
lehsmann
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Quote:
Originally Posted by bcampbe7 View Post
How 'bout a video of the sound?

One thing I would do is spray the mesh with grill paint to prevent the rust.
Ok thanks,will do,its only for the timebeing till i can afford a proper exhaust!Will try to make a video but i only have an iphone not a video cam!

2000 E39 M5 Oxford Green Metallic(DD)

Evolve AlphaN
Evolve Power Tune
Evolve Headers
Evolve IATS
Decatted OEM Exhaust
6000K Angel Eyes
6000K Fog Lights
6000K Low and High Beam

Wanted:Lower Oil Pan(even with stripped bolt threads is ok),DSC Control Module/ABS unit

1988 E30 325i Coupe White(Weekend Toy)
E34 535i Drivetrain
Express Works Suspension
Custom Exhaust
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post #8 of 10 Old 22nd February 2012, 06:53 PM
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Cool.
The main reason to go a step further and do straight pipes is for weigh savings (those suckers are heavy) and nicer tips.

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post #9 of 10 Old 23rd February 2012, 01:39 PM
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Pretty certain that would fail the MOT here in the UK as it would allow exhaust fumes into the cabin - rather you than me. Its a low rent mod that has no place on the M5 IMHO

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Last edited by M5 Russ; 23rd February 2012 at 01:42 PM.
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post #10 of 10 Old 26th February 2012, 06:06 PM
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I have to say that years ago I thought about opening up the cans to see what was inside as well...

But, uh, although I might have removed everything - had I done it - - I'm pretty sure I would have then welded them back up/completely closed...

The reason is it is necessary to get the exhaust beyond the rear of the car - so you don't get some of it back inside - and imho - completely closing them keeps the car from looking hacked up so to speak...

I would recommend that you consider a muffler delete - with the tips some board members have used (they have resonators inside the tips) they are also a low cost mod - search and you will find them...

.

Last edited by MarkQC; 26th February 2012 at 06:07 PM.
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