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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...
  #66  
By Revlis on 09-05-2007, 04:52 PM
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Quote:
Originally Posted by kirkx5m View Post
confirming the mod works, the exhaust is louder and throatier but confirmed with my tech and longtran's claim that the car will lose some hp at top end, but if that is not minded, this works!!!!!!!!!!!!!!
ON a N/A car that makes some sense I think.
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  #67  
By "07"BobbyBimmer on 09-07-2007, 11:48 PM
Quote:
Originally Posted by HyperM3 View Post
This helps the cats warm up properly and get to operating temps. He said when this is disabled, you run the risk of damaging your emissions equipment.
I think he's full of sh*t, the tech, not HyperM3. Do you realize how many people have done the golf tee mod in one form or another and have had it that way for quite a while. Just because it's not registering any codes, the way that unplugging the electrical connection does, the golf tee mod is doing the exact same thing and we have not heard of numerous damage to the emissions equipment with the golf tee mod
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  #68  
By itsbrokeagain on 09-08-2007, 06:07 PM
I was about to say the same. How many people out there are running exhaust systems that dont even use that vacuum line anymore, and arent getting problems? 02 sensor failures are just a freak occurance...it happens sometimes to random cars..you replace it and off you go.

I think Im going to plug the line now and see what she does.
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  #69  
By jrod1014 on 09-09-2007, 03:52 PM
I just did mine... Sounds different already, and I just let it idle... I'll drive around when the weather is better... No lights on the dash

Edit: Also felt the exhaust coming out of both pipes ... The idle growl sounds neat
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  #70  
By Stinger on 09-09-2007, 08:12 PM
Has anyone done it this way with an E93? I was trying it in my car and noticed that the trunk of course is different and I've undone two screws and have yet to find the part to disconnect (coming from the driver's side of the trunk like the pics here on the E92.)
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  #71  
By thegeneral101 on 09-13-2007, 08:51 AM
I unplugged it to see if it sounded different, and it does. My question is...If I plug it back in, is there a way to delete the code that it logged?
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  #72  
By HyperM3 on 09-14-2007, 12:30 PM
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Quote:
Originally Posted by thegeneral101 View Post
I unplugged it to see if it sounded different, and it does. My question is...If I plug it back in, is there a way to delete the code that it logged?
Only at the dealer. Its not a code that a C-reader can delete.
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  #73  
By Rusty's508whp on 09-19-2007, 03:44 PM
Unplugged mine too, it sounds better. I dont know if its just me, but I feel like there is less punch from 1500 to 2800?
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  #74  
By cgillio on 09-29-2007, 09:16 PM
Here is a nice diagram that shows your more of the component.
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  #75  
By dexter on 11-04-2007, 09:18 PM
i just did this mod and i can say i definitly notice a difference all around, and especially at idle. i also noticed that the turbo whistle is a lot luder with this performed. and no im n ot manifesting this. none of that placebo BS. thanks for the helpful info. iots things like this that make me love this forum so much.
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  #76  
By Dubai2LA on 11-20-2007, 05:17 PM
I tried this out about a week ago and i noticed a difference immediately. Great find. It took me only seconds to do. Idle sounds awesome. Smoke comes out of both exhausts now when I turn on the car.
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  #77  
By BayerischeMW on 11-21-2007, 05:21 PM
i wonder what effect this has on the cars startup procedure?

when i start my car (when the engine is cold), the exhaust only comes out of on of the two exhaust pipes until the RPMs drop in about 40-60 seconds. then the sound changes, and the valve opens and out comes exhaust from both pipes.
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  #78  
By Jason on 01-24-2008, 05:56 PM
Interesting. Added to DIY Master List - http://www.e90post.com/forums/showthread.php?t=1721
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  #79  
By I335 on 01-24-2008, 06:31 PM
In order to avoid the codes, can't we just do the golf tee mod at this end of the hose - is it easier to get to in the trunk?
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  #80  
By slant83 on 01-24-2008, 06:40 PM
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Unplugged..sounds great! I'll know best after a week of evaluation to see about performace. Screw the codes..you can always plug it in "loosely" before a dealer visit and pretend it "must just have been loose" from the factory or all those potholes.
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  #81  
By wrh3 on 01-27-2008, 12:02 AM
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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:

Last edited by wrh3; 02-11-2008 at 12:08 PM.
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  #82  
By arabbmw on 01-30-2008, 12:29 PM
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Quote:
Originally Posted by Rusty's508whp View Post
Unplugged mine too, it sounds better. I dont know if its just me, but I feel like there is less punch from 1500 to 2800?
anyone else experience a loss of power?
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  #83  
By BMW///Motorsport on 02-01-2008, 05:16 PM
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sounds great on start up... easy to unplug and re-plug if you don't like the results.
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  #84  
By Year's_End on 02-02-2008, 06:57 PM
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Wah-wah-wee-wah! This was easy as hell to do! I recommend that anyone with a 335i to try this out for sure! A bit of droning at 60+, but that can be fixed with a simple replugging.
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  #85  
By AJayE92 on 02-03-2008, 10:28 AM
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Thats Pretty Fuckin Awesome, still considering whether i should do it or not
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  #86  
By hov333 on 02-03-2008, 10:56 AM
i just put a metal BB in the line and plugged the hose back where it was, it took me less time than it would take many to get to where the actuator is. essentially the two mods are the same thing so I have no idea where the OP got his thread title from.
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  #87  
By Heat00 on 02-03-2008, 04:10 PM
I'm guessing it needs to be unplugged while the car is off?

I'm going to do it now, what the hec, can always plug it back in right..lol
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