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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.



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Revlis's Avatar DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.
Revlis
08-28-2007
OK I know I am not the first to do this, someone had to clue me in, but instead of plugging, crimping, or otherwise disconnecting the vacuum line under the car, just unplug the actuator in the trunk in front of the drivers side tail light. I was a little unclear as to how this works, but it's dead...
  #506  
By techwhiz on 02-11-2012, 11:09 PM
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I'm a new e90 owner. Just picked up a sedan with a sports package and 47K miles. I'm loving it.

Anyway, I owned an e36 M3 and it didn't have the flap, but the same year 328i had the flap. It was on the 328i for sound control and to make the cats warm up a little faster.
I started my e90 cold and noticed for the first 40-50 seconds the flap was closed. I don't know if it closes back up or not. It could just be a cold start function.

I know that there are no performance exhaust systems that have this.
I didn't do either the ball bearing/golf tee or unplug the connector. Unplugging the connector may register a fault because you have opened the circuit. Whether or not it matters is another story.

I went on eBay and did a search for the following after reading the first couple of pages:
PINCH VALVE CLAMP

I bought a couple for ~$3.
I'll put it on the hose inside the panel in the trunk.
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  #507  
By andyliew93 on 02-14-2012, 12:01 PM
I did unplugged the connector... but exhaust sounds the same ? so whats wrong with it ? anybody can help ? :\
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  #508  
By techwhiz on 02-16-2012, 02:33 AM
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Put the clamp in and got a immediate different sound.
The medical pinch clamp is just what the doctor ordered. 8-)
The pun was intentional.
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  #509  
By fmusignac on 02-24-2012, 06:28 PM
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2012 335i Convertible

Could someone please tell me how to do this on a 2012 335i Convertible? There's nothing like that on the drivers side of my car. There is only one cable that connects to the light.
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  #510  
By SpartanGA on 03-09-2012, 03:56 AM
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Quote:
Originally Posted by fmusignac@gmail.com View Post
Could someone please tell me how to do this on a 2012 335i Convertible? There's nothing like that on the drivers side of my car. There is only one cable that connects to the light.
I was told the connector is either buried or in another location.

The alternative is to remove the vacuum line from the muffler itself. The original method. and plug or crimp that line.
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  #511  
By 335iM_Power on 03-11-2012, 10:26 PM
Quote:
Originally Posted by elitefusion
I did this yesterday as well on my 2011 335i xDrive Coupe (automatic) and it sounds AMAZING! i did notice that the gas in the car started to drop in MPG for some reason, but i think its because i was in traffic and just happened to pay attention to it a bit more then usual lol
Hey did it show any errors after that? Cuz I do too have 2011 335i and I don't want the dealer to find out. : thanks
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  #512  
By Game on 03-12-2012, 11:20 PM
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Damn it, this threw an error code for me.
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  #513  
By bornadog335i on 03-22-2012, 07:34 PM
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Quote:
Originally Posted by Paul Stig View Post
Folks, I use this lazy way, adding a switch to turn golf tee mode on or off.
How did you do that?
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  #514  
By Beemw335 on 03-26-2012, 11:50 AM
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Quote:
Originally Posted by Game View Post
Damn it, this threw an error code for me.
It throws a hidden error code that obly a codereader could pick up.
Its no big deal.
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  #515  
By Game on 03-26-2012, 12:55 PM
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Quote:
Originally Posted by Beemw335 View Post
It throws a hidden error code that obly a codereader could pick up.
Its no big deal.
The code showed up on my front display.
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  #516  
By pj94z on 04-18-2012, 11:41 AM
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I just unplugged the connector on my 2009 335i sedan.

No error codes on dash board.

Sound is sweet ! Its not ricey loud, but u can notice the difference ...its a more "classy loud" , if you will.

Also, after mod, i can now hear the "woosh" of the turbos as they spool and that sounds amazing never heard this sound before prior to modding !

I took a short idling vid before / after mod.... ill put this up if u guys want ?
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  #517  
By SpartanGA on 04-18-2012, 12:27 PM
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Quote:
Originally Posted by fmusignac View Post
Could someone please tell me how to do this on a 2012 335i Convertible? There's nothing like that on the drivers side of my car. There is only one cable that connects to the light.
I did it the old fashion way with my convertible. I unplugged the rubber tube near the driver side tailpipe and zip tied it in half to pinch it shut.
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  #518  
By Viick on 04-20-2012, 12:20 AM
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Quote:
Originally Posted by pj94z View Post
I just unplugged the connector on my 2009 335i sedan.

No error codes on dash board.

Sound is sweet ! Its not ricey loud, but u can notice the difference ...its a more "classy loud" , if you will.

Also, after mod, i can now hear the "woosh" of the turbos as they spool and that sounds amazing never heard this sound before prior to modding !

I took a short idling vid before / after mod.... ill put this up if u guys want ?
Yes, Is the drone heavier? Upload or link!
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  #519  
By Bmwnsxr on 04-23-2012, 05:55 AM
Doing this will make you FAIL your emissions test. Don't do it, it's not that great and just brings more problem. Stupid!
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  #520  
By GRLPWR on 04-23-2012, 07:46 AM
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I love the difference in sound when unplugging the actuator, especially the gurgle on the decel. It will throw a hidden code, not a big deal. However, I've been dealing w/o2 sensor codes for some time and, after getting a carbon cleaning, changing plugs, and replacing all o2 sensors, I swear unplugging the actuator had something to do w/throw these codes. I've done all kinds of testing w/leaving it plugged vs unplugging and doing spirited driving under both circumstances and so far, 2wks later w/it plugged, the codes have not returned. Call it coincidental, but for me, there's some sort of link b/tween that actuator and the 02 codes. Oh, how I miss the sound, but oh how I can't stand getting those codes. I may wait another week or two and unplug it again, do some drives, and see if the codes come back. If they do, there's definitely a link. As for the golf-t mod and the clamp mod, I didn't notice any difference.

So, for those of you contemplating unplugging it - go for it! I'm running a stock setup w/catless downpipes and definitely noticed a difference in sound.
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  #521  
By cpcamp08 on 04-23-2012, 03:23 PM
Quote:
Originally Posted by wrh3 View Post
We had this valve on VW R32s and a lot of guys used medical supply clamps on the vacuum tubing, you can turn the mod on and off by pressing the clamp. A lot of medical supply places give free samples online:

Is only one medical pinch clamp required to perform the mod this way?
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  #522  
By porkchops! on 04-24-2012, 09:24 PM
Unplugged mine tonight... Definitely more aggressive! And no errors from what I can tell. E90 pre-lci 335xi btw. Easiest DIY I've ever done!
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  #523  
By Lankster on 05-02-2012, 02:17 AM
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Quote:
Originally Posted by porkchops! View Post
Unplugged mine tonight... Definitely more aggressive! And no errors from what I can tell. E90 pre-lci 335xi btw. Easiest DIY I've ever done!
Fantastic cuz thats my exact car. Doing it tomorrow on the way to class.
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  #524  
By Lankster on 05-02-2012, 02:20 AM
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Quote:
Originally Posted by Paul Stig View Post
Folks, I use this lazy way, adding a switch to turn golf tee mode on or off.
Details on how you achieved this?
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  #525  
By kfrazie1 on 05-02-2012, 07:32 PM
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did this and got a service engine soon light after about 500 miles with it unplugged.
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  #526  
By Lankster on 05-03-2012, 03:06 AM
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Quote:
Originally Posted by kfrazie1 View Post
did this and got a service engine soon light after about 500 miles with it unplugged.
Has to be a coincidence. Say you get a DINAN exhaust, which is endorsed by BMW and is covered under their manufacturer warranty. The DINAN exhaust has NO actuator flap and does not control which pipe exhaust comes out of. The actuator is mostly a sound dampener and slightly warms the cats up faster. After that the actuator is mostly for sound. Just my .02 but ready with firesuit.
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  #527  
By kfrazie1 on 05-03-2012, 08:57 AM
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Quote:
Originally Posted by Lankster View Post
Has to be a coincidence. Say you get a DINAN exhaust, which is endorsed by BMW and is covered under their manufacturer warranty. The DINAN exhaust has NO actuator flap and does not control which pipe exhaust comes out of. The actuator is mostly a sound dampener and slightly warms the cats up faster. After that the actuator is mostly for sound. Just my .02 but ready with firesuit.
It is possible that it could be a conicidence. I mean 500 miles is a while. I would imagine it would have triggered the SES sooner. I scanned with my Bav Tech and I had no engine fault codes or shadow fault codes. I short tested all modules and had no codes related to the engine. Cleared all other misc codes (radio, rain sensor, bluetooth, etc...) and reset the ECU. I drove the car for 25 miles and the SES light is still on. Not sure how to clear it. I just don't undertsand why Bav Tech is not picking up a code for the SES......
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