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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...
  #176  
By Mech_Man on 09-10-2008, 10:31 AM
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Quote:
Originally Posted by booyah View Post
I just took the rubber vaccum hose off at the tail-pipe, all is well and sounds great. Much more tone now from just normal driving around I noticed
I hope you plugged the vacuum hose.
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  #177  
By labrit on 09-12-2008, 03:14 PM
So what's the best way to do this - there's so many conflicting opinions that after 6 pages of reading i am thoroughly confused.

This thread would benefit from a summary.
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  #178  
By booyah on 09-12-2008, 10:18 PM
Hmmm no I didnt plug anything!! Why
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  #179  
By Mech_Man on 09-13-2008, 01:40 PM
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Quote:
Originally Posted by booyah View Post
Hmmm no I didnt plug anything!! Why
Did you not end up with a vacuum hose that is now open?
That is bad, kind of like the exact reverse of leaving your garden hose with one connection open. Other connections might get water, but not at the correct pressure and the pump has to work harder.

Plug it with an inch long piece of dowel you run through a pencil sharpener.
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  #180  
By wc19 on 09-14-2008, 03:04 PM
my car is stock and alot of my friends and even the bmw workers says my car is louder than usual. So I decided to try out this mod and my car got noticeably louder than before. AWESOME thanks!
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  #181  
By wtbane92 on 09-23-2008, 09:46 PM
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Just did the mod, fairly easy and painless. I did get some more rumble out of the stock exhaust but I also notice that the turbo spool sound got a bit louder too. Did anyone notice this?
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  #182  
By Christos on 10-04-2008, 05:40 PM
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Are there any BMW gurus on this forum who can explain why and what is the purpose of this actuator and what are the negative consequences of unplugging this? Does the exhaust come out both pipes, all the time or alternate between them? There is obviously a good design reason to have this actuator in there, what its it though?
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  #183  
By kingsario on 10-14-2008, 07:56 PM
I'm going to the track Mod!!! lol
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  #184  
By Turkishexpress on 10-15-2008, 09:25 PM
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On a turbo car I can't see the advantage of increasing the restriction by having that valve active at any time but I can see the disadvantage. In any case, saying that this mod is bad for your car doesn't make sense because if it was no one would get an aftermarket exhaust.
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  #185  
By kingsario on 10-18-2008, 06:36 PM
I did this and it works.....I just unplugged the connector while the car was running and the exhaust got loud....yumm it sounds good. I have noticed that the car takes longer to get warm.
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  #186  
By cshipp on 11-10-2008, 10:07 AM
I did this and the car is definately louder, sounds better. No difference in power that I noticed. However, I plugged mine back in because I didnt like leaving it hanging there. And I also figured that there must be some reason for it... Another consideration is that my car already goes to service enough, I didnt want to add another trip or give them an excuse for something else going wrong.
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  #187  
By Aurora Bearialis on 12-04-2008, 11:51 PM
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I just did it during the commercial break lol so easy, I guess I will drive it tomorrow to see if there is a difference but form what I am reading I can't wait to hear the difference
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  #188  
By darkphantom on 12-05-2008, 02:48 AM
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^just noticeably louder at startup and under 3k RPMs
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  #189  
By e92leon on 12-05-2008, 03:08 AM
I did "golf tee", anyone switch from golf tee to this? any difference?
for some reason my exhaust sounds really stock
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  #190  
By Pseudo Nim on 12-08-2008, 04:57 PM
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How do you remove the felt panel? Is it clip-on, or are there screws somewhere (am not near the car)?
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  #191  
By Pseudo Nim on 12-09-2008, 09:42 AM
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Update - did the mod (the panel was just a pry-out, nothing fancy involved, though I recommend trying to pry it out from the deeper end, rather than the one closer to the trunk opening, as the clips there are straight instead of angled). That being said - the sound is definitely quite different. I like it better this way. I can understand why BMW wouldn't do this by default, though - this is NOT the typical sound one expects from a BMW - this is more of an "enthusiast" WRX / Evo / whatever sound. I don't see an average mid-40s family man buying a 335xi and liking this - he'd probably call it "loud", or whatever.

That being said, I paid attention to cars driving this morning: it was a few degrees below zero, so you could easily see smoke - and all the 335s I saw had exhaust coming only from the passenger side. I found it amusing, and realised I never paid attention

Thanks OP!
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  #192  
By bmwmike335 on 12-13-2008, 07:42 PM
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hey guys, i tried doing this but was having a hard time pulling the damn thing out after pushing in that metal clip thing...
am i just not tuggin hard enough? how did u guys do it, how well did u give it a good tug? and is it as hard to put back on as it is to take out..

i dont mean hard as in its diffucult, its just a pain in the ass with that cloth cover thing in the trunk, not very flexible... post or PM me pleasee.

thanks
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  #193  
By bmwmike335 on 12-14-2008, 02:49 AM
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never mind lol i was puling on the wrong cord.

this "mod" or trick or whatever is INSANE, even if you dont want it i thnk everyone should try it for just a sec and hear how the 335i SHOULD sound stock.

the growl at 1500 rpm is to die for, i was going nuts in my parking lot, i drove it around and felt like i had some crazy exhaust system when all i did was repove a plug.

even though its incredible, im gona drive normally with it plugged in since im gettting new exhaust tips and resonators off next week.

but i give 2 thumbs up, quick, super easy, and super noticible.
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  #194  
By MCMLXXXIX on 12-14-2008, 03:01 AM
dude sick, gonna have it done and go the whole day with it to see what its like
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  #195  
By bmwmike335 on 12-14-2008, 03:03 AM
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youll love it man, sounds very crisp. i sorta feel weird driving with it in the freeway, so i plugged it back in before i got onto the 5.
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  #196  
By pgbird on 12-16-2008, 02:10 AM
This mod seems really interesting... i just got a 335 cabriolet...but the back looks kinda different overall from the pictures...would anyone kindly show me how this is done on the E93??!! thanks in advance
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  #197  
By bmwmike335 on 12-16-2008, 03:57 AM
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when i was swifting through the other pages i remember seeing someone who said how to do it on a e93. if you search through it im sure youll find it.
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