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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...
  #440  
By Leemot on 04-27-2011, 06:19 AM
Quote:
Originally Posted by E90Vader View Post
This doesn't make any sense... Say you bought a BMW sports tuned exhaust, or an after market exhaust. You won't have a valve actuator so would the car then go into limp mode?? I think not...
Im just saying thats what happened to mine maybe its the drop in voltage it detected because i unplugged the connector if you just crimp the pipe that might work better its not detecting a broken connection then ?
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  #441  
By 335NarekXI on 04-27-2011, 10:55 PM
Is it likely anything will go wrong? An if something went wrong wouldy warranty cover this? Thanks
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  #442  
By Yoro35i on 05-02-2011, 09:39 PM
for right hand drive cars , would it be on the right hand side or still on the left driver side?
i found i got that connect on the left driver side of the car and cannot hear the difference?
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  #443  
By aj555 on 05-07-2011, 08:21 AM
It will throw a shadow code to BMW when they hook your car up. Thats a no go for them. You can just look for the small vacuum cord that plugs into the muffler. Look under the drivers side rear wheel. Pull it some so there is a bunch of slack. Fold it in half, and zip tie it. Your hands will get a little dirty, but it takes 2 minutes. Plus if your car is still under BMW warranty all you have to do is cut the zip tie before you go in, and no one will know.
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  #444  
By ar_mike on 05-17-2011, 01:42 AM
I just did the same mod this past weekend by using a 7/32" ball bearing to plug the vacuum hose. Love the sound now!! I do a lot of hwy driving and at around 75mph, you can hear the exhaust purring in the background. Turn the music up slightly louder and you won't even hear it. On the outside though, it's actually pretty audible IMO. =D
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  #445  
By maxipad96 on 05-18-2011, 11:49 PM
What happens with aftermarket exhaust? Are you effectively throwing a code every time as well?
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  #446  
By danny156b on 05-19-2011, 05:58 PM
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I unplugged the line on my car and it sounds nice. I just hope none of the things that were mentioned that went wrong with others hapen to me
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  #447  
By jaco on 05-22-2011, 11:53 AM
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I took my car in several times with it unplugged and never had an issue. I can't see how it would be an issue. The 335 performance exhaust doesn't have the valve. I would rather have it not functioning like this mod does than have it plugged and zip tie the line.
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  #448  
By troylin on 05-23-2011, 05:28 AM
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e93

read all 21 pages, could not find out how to do it on my e93

can anyone help?
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  #449  
By wes77 on 05-24-2011, 12:23 PM
This is such a cool and quick mod....thanks for the trick
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  #450  
By Omghi2u on 05-24-2011, 05:37 PM
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I unplugged the cable for my '08 e92 and havent experience any major related problems and stealership hasnt said anything to me after many services. love the sound, and cant stand the oem setting since it sounds like a car with silencer on.

The only affect that i notice might be a problem is that the flap inside the exhaust might be sticky now since its been on the open position for 3 years. When I take my car in for service, I would plug the cable back in, and will hear the flip closing/opening during startup and its a pretty loud metal *clink* sound. differently louder then when it was new, and clean pipe. my guess, the flap has built up crap in there and causing it to make a louder then normal clink sound when running. either way, once i am done at service, i unplug it back once i drive out the stealership. been debuting if i should bring up the clink sound before my warrenty expires in 6months and get them to replace the flap..............
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  #451  
By Never-Enough on 06-03-2011, 09:04 PM
Those that say they got a code from it, have you verified what the code was & that it was due to disconnecting this line?

I don't see how it'd toss a code when none of the aftermarfket exhausts have it.
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  #452  
By Peter_Griffin on 06-05-2011, 07:31 PM
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DONE!

(second post...) First "mod" done after tinting the windows...took about 10 seconds start to finish, and it's definitely noticeable on start-up.

That should hold me over until I get a full exhaust on!

Thanks for the DIY-write up.
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  #453  
By BMWLove86 on 06-08-2011, 12:42 AM
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Just did this mod. I can tell the car sounds a noticeable deal better at cold start. I haven't driven around with it unplugged yet. There is more of a smoothness and louder sound at start. When plugged in I almost here this slight metallic rattle I guess it's the valve opening and closing or whatever. Not sure I will leave it unplugged I plan to get an aftermarket exhaust next month so we'll see. I did notice more gaeous fumes (emissions) after revving a little with the thing unplugged.
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  #454  
By reaper335 on 06-08-2011, 03:13 PM
i see a lot of people say no consiquences but this will void your warrenty if the dealer wants to be a dick about it. i just had a convo with one of the bmw techs and basicly he told me it wasn't the best idea to do this mod for all the reasons that have been stated already. idk i'm going to plug mine back in and wait to get an aftermarket exhaust or at least untill i'm out of warranty
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  #455  
By OfficialBOLO on 06-10-2011, 09:12 AM
would a CANTool be able to detect and clear the shadow code if it were to be logged in the ecu?
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  #456  
By OfficialBOLO on 06-15-2011, 02:53 PM
didnt throw a code, best mod ever, sound is fantastic
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  #457  
By Jeffrolite on 06-19-2011, 01:46 PM
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Unplugged mine this morning. Nice sound at initial start up, but the change is very subtle otherwise. I wonder if the subtlety is attributed to the sedan and/or xi setup. I believe the the pipe is routed different around the AWD. My friend has the e92 and it sounds much throatier in all situations. Does anyone else with an e90 xi feel the change is very minimal?
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  #458  
By raceyBMW on 06-20-2011, 02:16 PM
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E90 has a resonator in the exhaust, where the E92 only has an X-pipe.
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  #459  
By ecibis on 06-24-2011, 03:42 PM
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Anyone know if code thrown can be erased by Cobb?

I am planning on buying a Cobb soon, does anyone with a Cobb know if the code thrown from this mod can be deleted by the AP unit? Thx
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  #460  
By Jeffrolite on 06-25-2011, 08:24 AM
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Quote:
Originally Posted by ecibis View Post
I am planning on buying a Cobb soon, does anyone with a Cobb know if the code thrown from this mod can be deleted by the AP unit? Thx
+1
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  #461  
By orbhot on 06-25-2011, 07:24 PM
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This mod will not cause a service / check engine light, but it will cause your computer to show OBD II codes p2401 p2419. It doesn't seem to negatively affect performance. However, I would be sure to plug the connector back in before any dealer service trips.
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