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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-23-2008, 11:34 PM   #21
TerraPhantm
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Only 325xi's and non-ZHP 330i's have the flap. I did this mod to my mom's car, and it does seem to make a difference (to me it sounds louder inside her car than it does inside my ZHP), but on the outside, the ZHP (and therefore every aftermarket exhaust) is still louder.
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Old 09-23-2008, 11:37 PM   #22
ejamin73
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Quote:
Originally Posted by Team_Persia View Post
i dont know how it is in Puerto Rico, but in the US i think its only on 330's
We have exactly the same cars here.
Same models & spec.
I have a '04 325 Sport.
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Old 09-23-2008, 11:44 PM   #23
ejamin73
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Quote:
Originally Posted by TerraPhantm View Post
Only 325xi's and non-ZHP 330i's have the flap. I did this mod to my mom's car, and it does seem to make a difference (to me it sounds louder inside her car than it does inside my ZHP), but on the outside, the ZHP (and therefore every aftermarket exhaust) is still louder.
That means that mine have it, right?
I can't find it
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Old 09-23-2008, 11:52 PM   #24
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Quote:
Originally Posted by ejamin73 View Post
That means that mine have it, right?
I can't find it
i dont think so man, Xi's are the AWD model, if you have a 325i then you dont have it.
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Old 09-23-2008, 11:52 PM   #25
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Quote:
Originally Posted by TerraPhantm View Post
Only 325xi's and non-ZHP 330i's have the flap.
My 99 328i sedan has the flap but it does not work.
I bought 2nd hand and have never seen or heard it closed
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Old 09-24-2008, 12:12 AM   #26
ejamin73
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i dont think so man, Xi's are the AWD model, if you have a 325i then you dont have it.
THANKS
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Old 09-24-2008, 05:24 AM   #27
fwardell
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Did the golf tee mod on my '03 330i. Great improvement in sound - throaty but mellow plus some burbles on coasting! Even the wife likes it.
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Old 09-24-2008, 06:37 AM   #28
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Funny, i just saw this flap in action last night. I was behind a 330i at a redlight and when it turned green and they started to accelerate, the lights from my car were shining up the tailpipe and i saw the light reflect off the flap as it was opening, it was pretty funny. On my car its stuck in the open position all the time. When the car is running when its cold push the flap closed with your fingers and youll hear a big difference in exhaust sound.
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Old 09-24-2008, 07:40 AM   #29
GoingNuts
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Maybe some WD40 is needed to do the reverse golf tee mod.

So what does it sound like when closed ? Mine just go quietly poooof, pooof, pooof while opened, stopped, and idling. It sounds a bit I know. But I don't really like any sound but the sound of my thinking.
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Old 09-24-2008, 01:28 PM   #30
Sicily1918
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Quote:
Originally Posted by Team_Persia View Post
i dont know how it is in Puerto Rico, but in the US i think its only on 330's
Quote:
Originally Posted by TerraPhantm View Post
Only 325xi's and non-ZHP 330i's have the flap.
Mine has it... '03 325Ci...
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Old 06-11-2009, 01:03 PM   #31
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Quote:
Originally Posted by xi_ter View Post
The Golf tee mod is possible with the 325xi and the 330i/xi exhaust. The exhaust system has a valve on the innermost pipe that is closed at lower revs and opens when tach exceeds 2000 rpm.



The golf tee mod is done by pulling the tubing off the gate above the valve and sticking a tee or bolt into the end. Ziptie to ensure tee stays in place.



This keeps the valve open all the time (a lot of city driving is below 3000 rpm) for a throatier exhaust note and great flow of exhaust.
BMWs purpose for the valve is to reduce exhaust noise as much as possible, probably for obscure vehicle regulations.
My 2003 330i has this and it was making a lot a noise at lower RPMs,while at turns or accelrating.....This flap seems like its loose and makes a weird "crankinngg" noise....any ideas on how to fix that rattle noise??
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Old 06-11-2009, 01:16 PM   #32
JRod82182
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I did it to my 325xi and it made a difference in the sound at low rpms.
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Old 06-11-2009, 01:48 PM   #33
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I did the golf tee mod and now I'm getting 500hp at the wheels!
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Old 06-11-2009, 08:34 PM   #34
xxenycejattxx
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the "rattling" sound went away with the DIY....it sounds better than OEM!!!
Its nomore a DOT authorized exhaust....nice write up with pictures!!!
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Old 06-11-2009, 08:57 PM   #35
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I love the M6 reps.

but, I will be getting style 313 someday...



topic wise: the golf tee mod definitely made a deeper note on my car.
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Last edited by i_ween; 06-11-2009 at 08:59 PM. Reason: topic wise
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Old 08-19-2009, 09:33 PM   #36
330i_guy
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i just checked mine but it stays open during idle and the tubing is still connected.....
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Old 12-24-2009, 05:33 PM   #37
bimmerman25
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my 330 also has this flap the doesnt close when idling. hoping to find someone that will watch and see if the flap closes at any given rpm
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Old 12-24-2009, 11:47 PM   #38
TerraPhantm
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Quote:
Originally Posted by dbplumb View Post
My 99 328i sedan has the flap but it does not work.
I bought 2nd hand and have never seen or heard it closed
I didn't even think of the M52TU cars; I honestly don't know much about them.

Quote:
Originally Posted by Sicily1918 View Post
Mine has it... '03 325Ci...
Is your car a SULEV? I think those have 330 exhausts.
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Old 12-25-2009, 01:46 AM   #39
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my 01 330ci has the flap BUT it's not controlled by a vacuum hose, but instead a mechanical arm that turns the valve
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Old 01-01-2010, 10:21 PM   #40
eneka
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SULEV 325i has it.

I did the mod to mine but i think i'm going to plug it back. To me it sounds more like an annoying drone.
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