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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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      11-21-2016, 09:25 PM   #705
vrmoreno3
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This was interesting, and now my left pipe is dirty
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      11-21-2016, 10:49 PM   #706
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The first mod I did to my newly acquired 335 and perhaps the most gratifying.
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      11-28-2016, 03:23 PM   #707
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Quote:
Originally Posted by tcphoto View Post
The first mod I did to my newly acquired 335 and perhaps the most gratifying.
I have to admit, after 110k on the stock exhaust and the golf tee mod, I'm not even sure if I want a new exhaust for a daily driver. Once that engine is warm, the car has a great note.
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      05-22-2017, 01:42 PM   #708
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I unplugged the wire from the boot on the left hand side just under the tail light. Solved it 100%. It was rattling during startup and on acceleration.
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      05-25-2017, 03:37 PM   #709
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Just did this mod to my car, this is during a cold start with catless downpipes.

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      06-20-2017, 12:42 AM   #710
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Quote:
Originally Posted by JasW View Post
This has been asked a dozen times in this thread without a satisfactory answer. Does anyone with an E93 know where the actuator is? One poster suggested it was behind the tail light assembly door (light gray plastic thing on the top left in the pic below) and to dig deep, but everything I see in there is for the tail light.
You have to remove the carpeted panel with the two gray fastners in your picture just above the no luggage symbol.
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      07-09-2017, 11:35 PM   #711
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I just unplugged that plug, and there was absolutely no difference in sound .. wth ?
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      07-12-2017, 12:11 PM   #712
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FWIW, it seems pretty easy in my feeble little brain to do this...

If access to this plug is so easy as explained in the pics, Could you mount a small toggle switch in your dash or console and wire it up to that plug?

Then you would have a switch to either open or close the flap as desired....

just sayin
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      07-12-2017, 03:08 PM   #713
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Quote:
Originally Posted by CaddymanLNL View Post
FWIW, it seems pretty easy in my feeble little brain to do this...

If access to this plug is so easy as explained in the pics, Could you mount a small toggle switch in your dash or console and wire it up to that plug?

Then you would have a switch to either open or close the flap as desired....

just sayin
http://www.e90post.com/forums/showthread.php?t=1391955

I have my switch setup for either open, closed, or stock operation.
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      08-01-2017, 10:03 AM   #714
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Had a problem you could say.

I had this portion on my car already open cause I was working on the stereo. I saw this post and thought, "I know that part. I'll do this!"

Did it, sounded nice, drove, literally, 1/4 mile and it backfired/misfired, check engine light came on, and the car no longer had boost. I got out, put the sensor back, still no boost, AND when I'd start the car the RPMs would drop and almost stall, then jump back up.

Took it to a mechanic (BMW could get me in for a full week), he said the vacuum tube for the boost popped out and broke, and that the exhaust flap is just a coincidence.

Regardless, I'm terrified to do this again.

TL;DR
Had engine problems right after doing this mod, mechanic says it's a coincidence.
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      08-24-2017, 06:36 PM   #715
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2010 BMW 335i  [5.00]
Quote:
Originally Posted by AdamAllenE93 View Post
Had a problem you could say.

Took it to a mechanic (BMW could get me in for a full week), he said the vacuum tube for the boost popped out and broke, and that the exhaust flap is just a coincidence.

TL;DR
Had engine problems right after doing this mod, mechanic says it's a coincidence.
Thats funny, the exact same series of events happened to me. The charge pipe blew right off the intake manifold when I unplugged the cable.
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      08-24-2017, 07:57 PM   #716
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Quote:
Originally Posted by woopig View Post
Quote:
Originally Posted by AdamAllenE93 View Post
Had a problem you could say.

Took it to a mechanic (BMW could get me in for a full week), he said the vacuum tube for the boost popped out and broke, and that the exhaust flap is just a coincidence.

TL;DR
Had engine problems right after doing this mod, mechanic says it's a coincidence.
Thats funny, the exact same series of events happened to me. The charge pipe blew right off the intake manifold when I unplugged the cable.
Weird I did this to my car, had it on for about 3 months and no problems.

Decided I wanted to do a muffler and resonator delete and still kept the plug unplugged.

Still problem-free.
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      08-25-2017, 01:38 PM   #717
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Quote:
Originally Posted by AdamAllenE93 View Post

TL;DR
Had engine problems right after doing this mod, mechanic says it's a coincidence.
Your mechanic is right.
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      08-29-2017, 06:46 PM   #718
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Quote:
Originally Posted by Boost XXI View Post
Yes, I can confirm that's where the connector is on the E93. I had to remove the rubber panel that covers the light assembly as well as the trim piece on the side.
So I'm an idiot apparently, I can't remove the trim piece that's on the side of the light assembly panel. I didn't want to try and force it...suggestions?
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      10-14-2017, 09:50 AM   #719
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Quote:
Originally Posted by Revlis View Post
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 simple, easily reversible, and doesn't involve digging under the car. Win-Win!

So a big thanks to whomever it was that clued me in... I like the sound of the dual exhaust all the time without the bypass, but I also like being able to quiet it down if I am going on a long interstate drive... So here's a Barney Style Step by step to a better exhaust sound on demand. :rocks:

--------ETA: Perform at your own risk, Myself and many others have had no ill effects, but you never really know.---------------
Anyone know where this plug is on a cabriolet? I see there is a description in the tread, can't find it. Anyone have a pic?
Thanks

Last edited by fireman02169; 10-14-2017 at 09:56 AM.
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