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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Does such a mod exist? (dynamic exhaust)



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      12-22-2007, 12:29 PM   #1
skimo
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Does such a mod exist? (dynamic exhaust)

I am no guru so excuse my ignorance...

Is there such as thing as an exhaust with a switch to turn it "loud" vs "quiet" ?

Some sort of switch mounted in the dash that I can use to turn the sucker to "get the hell out of my way" mode or to "the kids are sleeping" mode...

Maybe a valve mounted in the pipes controlled by some servo motor....

If so, where can I get one? Whats the google keyword?

thanks
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      12-22-2007, 01:40 PM   #2
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I'm not sure of any aftermarket exhaust that still uses a flap like the stock exhaust, but you could always look into using electronic exhaust cut outs where you can basically bypass your mufflers by opening up a set of valves. Not sure if that's exactly what you are looking for though.
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      12-22-2007, 01:57 PM   #3
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Our PowerSound exhaust is somewhat what you're describing, using a valve mounted near the tips to open or close a valve for additonnal performance and sound. It has to be manually adjusted.

http://www.remusexhaustshop.com/power-sound-i-12.html
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      12-23-2007, 09:33 AM   #4
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Here you go:

A'PEXi Exhaust Control Valve (ECV)



The ECV was created as an alternative to the standard silencer typically fitted in the tip of performance exhaust systems to lower the sound output. The ECV (Exhaust Control Valve) is a spring loaded butterfly valve that can be installed to the main piping of an existing exhaust system. The angle of the valve can be modified on the fly from within the cockpit to provide complete control over exhaust decibel output.


Part #
155-A014 : Flange Type; 67mm
155-A019 : Pipe-Type; 80mm


It can be fitted on nearly any exhaust system you buy, in respect to the pipe diameter of course.
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      12-23-2007, 03:07 PM   #5
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thats what you need when you cut both cats...
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      12-23-2007, 03:37 PM   #6
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Haha... that apexi unit looks like it works off of a throttle cable. I would just go with an electronic cutout, even though the motors are built like crap and burn out if you hold down the toggle switch for too long.
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      12-24-2007, 12:41 AM   #7
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Quote:
Originally Posted by seven_227 View Post
Here you go:

A'PEXi Exhaust Control Valve (ECV)



The ECV was created as an alternative to the standard silencer typically fitted in the tip of performance exhaust systems to lower the sound output. The ECV (Exhaust Control Valve) is a spring loaded butterfly valve that can be installed to the main piping of an existing exhaust system. The angle of the valve can be modified on the fly from within the cockpit to provide complete control over exhaust decibel output.


Part #
155-A014 : Flange Type; 67mm
155-A019 : Pipe-Type; 80mm


It can be fitted on nearly any exhaust system you buy, in respect to the pipe diameter of course.
Thanks. I will look into it. But the question I beg to ask is...what happens when the valve is closed? I mean where does the exhaust go? Isn't it bad to "block the air?" ?

Thanks again..
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      12-24-2007, 01:13 AM   #8
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this looks interesting
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      12-24-2007, 02:18 AM   #9
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Quote:
Originally Posted by skimo View Post
Thanks. I will look into it. But the question I beg to ask is...what happens when the valve is closed? I mean where does the exhaust go? Isn't it bad to "block the air?" ?

Thanks again..
skimo
You're welcome. It doesn't fully close physically, the picture shows how the flap will be when fully closed.
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      12-28-2007, 02:08 PM   #10
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will this work for e92s? or even bimmers?
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      12-28-2007, 08:19 PM   #11
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Kriesegg offers this sort of exhaust

Its called valvetronic
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      12-28-2007, 08:47 PM   #12
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^^^^^^
And they cost a kajillion dollars.
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      12-29-2007, 03:26 AM   #13
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^^^and theres none for the 335
 
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      12-29-2007, 11:10 AM   #14
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well why cant u put a valve like this on our car? by looking at the picture it looks very thin and could probably fit somewhere between the midpipes
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      12-29-2007, 03:55 PM   #15
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bump
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      12-29-2007, 09:26 PM   #16
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I installed one of those APEXi exhaust valves on a CRX, it worked exactly as advertised. One caution, in fully closed position the car turns into a total pig and can't get out of it's own way.
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      12-29-2007, 09:52 PM   #17
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Quote:
Originally Posted by de.abeja View Post
in fully closed position the car turns into a total pig and can't get out of it's own way.
can you please specify what you mean by you cant get out of its way its supposed to be very quite when its almost closed correct? This looks like it can just go in like a regular exhaust gasket in between the pipes no? cmon guys i wanna get this to work, help me out, tell me what size I need and i'll test it out myself
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      12-30-2007, 03:43 PM   #18
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      12-30-2007, 04:50 PM   #19
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ok man...
looks like apexi has 51,54,80, and 95mm units...
our exhaust is 2.5" correct? which is 63.5mm.

http://www.sfxperformance.com/parts/Apexi.asp

call these guys and see if they can get what you want for an 2.5" exhaust..
its sun. or i would have just called them...

keep us posted and GL
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      12-30-2007, 04:52 PM   #20
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another link to browse:

http://www.raceinspired.com/p-3163-a...universal.aspx
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      12-30-2007, 05:12 PM   #21
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Quote:
Originally Posted by hov333 View Post
can you please specify what you mean by you cant get out of its way its supposed to be very quite when its almost closed correct? This looks like it can just go in like a regular exhaust gasket in between the pipes no? cmon guys i wanna get this to work, help me out, tell me what size I need and i'll test it out myself
He means with it closed it is a total restriction in the exhaust killing the engines power.

Op: Your best bet is electronic cut outs. Although you might be surprised how quiet some aftermarket exhausts can be during normal driving vs. how loud they are at WOT.
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      12-31-2007, 04:28 PM   #22
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what exactly are electronic cutouts? also, I dont think the valve closes completely since it will definately be detrimental to the engine so its got to be partially open no mater what. I'll give these guys a call on wed and let y'all know what happens
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