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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...
  #220  
By vgrani1g35 on 03-05-2009, 06:22 PM
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does unplugging the actuator make the car louder? unclear of the benefit..details
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  #221  
By vgrani1g35 on 03-05-2009, 06:26 PM
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im am new to the forum..i only check the first pg..it does make it louder..nice..going to do it right now! thanx
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  #222  
By jstar41 on 03-12-2009, 02:51 PM
ok.. did it in 2 mins.. now it goes.. RUUMM RUUMMMM.. ! ! :-)
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  #223  
By nick6753 on 03-14-2009, 01:31 PM
Just did this mod, noticeable increase in exhaust sound. Off to scan with BT tool to see if it throws a code.
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  #224  
By preciseeye on 03-14-2009, 01:39 PM
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Quote:
Originally Posted by nick6753 View Post
Just did this mod, noticeable increase in exhaust sound. Off to scan with BT tool to see if it throws a code.
curious, also, let us know if u can easily delete it
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  #225  
By scottjones on 03-15-2009, 05:27 PM
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??? throw code?

I just got my 335xi - have about 80 miles on it and am very tempted to try this.. but, dont want to get into a whirwind of **** from the dealer if it throws a code....

Anything yet?

Quote:
Originally Posted by nick6753 View Post
Just did this mod, noticeable increase in exhaust sound. Off to scan with BT tool to see if it throws a code.
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  #226  
By raceyBMW on 03-15-2009, 05:53 PM
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I have unplugged it a dozen+ times, and have never had the dealer say a thing about it. Just remember to plug it back in before you go, only takes a minute either way.
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  #227  
By TL on 03-16-2009, 02:06 PM
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good stuff
I tired this on my 335xi and found it about 10% louder and so did my passenger. The only bad thing to me is my passenger side tail pipe is much dirtier.
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  #228  
By Synikal on 04-02-2009, 09:49 PM
I just finished this mod while I had the car running and you can really tell a difference immediately. I even heard a little click must have been the bypass disengaging. No errors what so even what a neat trick! thanks!
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  #229  
By **335i** on 04-08-2009, 08:58 AM
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reading all this i want to ask: do u feel any power loss i mean in torque and hps? and will it harms anything?

thanks
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  #230  
By GB///M5 on 04-09-2009, 03:35 PM
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Thumbs up Unplugging the actuator from the trunk

This was an extremely easy mod and i honestly noticed a difference right away along with a couple other people. I received no error codes and dont care if it does throw some in the computer and not the dash; the dealer can suck it. They definitely will not notice it anyway and i dont think this will cause any problems in the future. The exhausts are a little louder and it sounds sweet!! Maybe it's just me but i noticed my DTC flashing more when i punch it off the line now like at a red light; it does feel slightly quicker off the line. The only disadvantage i think there is for gas mileage. I think i get about one or two less miles per gallon, but for the way it sounds i really dont care!!
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  #231  
By **335i** on 04-10-2009, 06:02 AM
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Quote:
Originally Posted by Donnie-Bay View Post
This was an extremely easy mod and i honestly noticed a difference right away along with a couple other people. I received no error codes and dont care if it does throw some in the computer and not the dash; the dealer can suck it. They definitely will not notice it anyway and i dont think this will cause any problems in the future. The exhausts are a little louder and it sounds sweet!! Maybe it's just me but i noticed my DTC flashing more when i punch it off the line now like at a red light; it does feel slightly quicker off the line. The only disadvantage i think there is for gas mileage. I think i get about one or two less miles per gallon, but for the way it sounds i really dont care!!
but there are people saying that it can cause damage to o2 sims and so on
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  #232  
By GB///M5 on 04-10-2009, 08:01 AM
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Quote:
Originally Posted by **335i** View Post
but there are people saying that it can cause damage to o2 sims and so on
o2 sensors go bad once in while its not an uncommon thing. Im almost positive that the o2 sensor going bad is not from unplugging the actuator. Also if i have any problems ill let you know, but everything will be fine
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  #233  
By **335i** on 04-10-2009, 08:17 AM
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Quote:
Originally Posted by Donnie-Bay View Post
o2 sensors go bad once in while its not an uncommon thing. Im almost positive that the o2 sensor going bad is not from unplugging the actuator. Also if i have any problems ill let you know, but everything will be fine
one of the forum members said to me:
Just crouch down behind the car by the left exhaust pipe and look underneath. Attached to the pipe behind the tip is an actuator with a rubber pipe attached to it. Just pull the rubber pipe off and stick something in the rubber pipe to block it.

do u know that doing this u dont get error codes and no probs on BMW service http://img301.imageshack.us/img301/7075/pic1f.jpg then u will avoid all error codes and everything
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  #234  
By GB///M5 on 04-10-2009, 09:17 AM
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Quote:
Originally Posted by **335i** View Post
one of the forum members said to me:
Just crouch down behind the car by the left exhaust pipe and look underneath. Attached to the pipe behind the tip is an actuator with a rubber pipe attached to it. Just pull the rubber pipe off and stick something in the rubber pipe to block it.

do u know that doing this u dont get error codes and no probs on BMW service http://img301.imageshack.us/img301/7075/pic1f.jpg then u will avoid all error codes and everything
That sounds interesting and will probably work...but the exhaust system in the pic is not from a 335; looks like a 330. Maybe it still the same concept. To tell you the truth though if by some chance you get an error on your dash its not something to really worry about the dealer can never deny you to fix it...its all covered under warranty. You gonna try doing that?
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  #235  
By **335i** on 04-10-2009, 09:23 AM
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Quote:
Originally Posted by Donnie-Bay View Post
That sounds interesting and will probably work...but the exhaust system in the pic is not from a 335; looks like a 330. Maybe it still the same concept. To tell you the truth though if by some chance you get an error on your dash its not something to really worry about the dealer can never deny you to fix it...its all covered under warranty. You gonna try doing that?
u mean as shown in this picture? maybe dont know yet
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  #236  
By Cptn Mo 703 on 05-06-2009, 10:25 AM
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How do you do this in a E93? I looked for that flap you remove...and couldnt find anything that looked like the picture.
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  #237  
By FoShizzle on 05-06-2009, 01:49 PM
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Quote:
Originally Posted by Cptn Mo 703 View Post
How do you do this in a E93? I looked for that flap you remove...and couldnt find anything that looked like the picture.
Its only on the 335 models.
If yours is a 335 and its not there, that would be very interesting.
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  #238  
By Cptn Mo 703 on 05-06-2009, 02:57 PM
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Quote:
Originally Posted by MikeJabb View Post
Its only on the 335 models.
If yours is a 335 and its not there, that would be very interesting.
yup 335i convertible..and theres this plastic/rubbery cover thing...and i removed it and it was just the wires and stuff for the tail lights
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  #239  
By FoShizzle on 05-06-2009, 03:07 PM
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Quote:
Originally Posted by Cptn Mo 703 View Post
yup 335i convertible..and theres this plastic/rubbery cover thing...and i removed it and it was just the wires and stuff for the tail lights
Its in there. Grab a miners hat and dig deep! Seriously though, it might be a little hard to find the wires. I found mine by touch and had to yank on it a little. Maybe some e93'rs can chime in here...
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  #240  
By kyd335xi on 05-06-2009, 04:47 PM
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ok just to let everyone know that unpluggin the actuator will throw codes but will not set a mil light on

so what ever u do do not unplug the actuator
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  #241  
By EuRoTUneR on 05-06-2009, 05:54 PM
so i read each post and what i have concluded is....
1- 335+330 have it 328+325 do not
2- it does through codes, but bmw either dosn't realize or assumes we just unplug them by now
3-sounds like about 70% of people agree there is a deff change in tone?
4-20% of people think there are long term effects?

sounds like i will be unplugging it tomorrow haha
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