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Old 11-19-2019, 07:45 AM   #1
sparky2708
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Do both tailpipes always emit exhaust?

Do both tailpipes always emit exhaust? I noticed exhaust is blowing from only 1 of the tailpipes. Is this normal. Notice how one of the tailpipes (the one on the right) is so much cleaner than the other... When I start the car nothing is blowing out of the right pipe


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Old 11-19-2019, 07:52 AM   #2
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Perfectly normal - the other side opens under hard acceleration.
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Old 11-19-2019, 10:57 AM   #3
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Do both tailpipes always emit exhaust? I noticed exhaust is blowing from only 1 of the tailpipes. Is this normal. Notice how one of the tailpipes (the one on the right) is so much cleaner than the other... When I start the car nothing is blowing out of the right pipe


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Given that there is only one pipe entering the back box then I would say yes. You should expect exhaust fumes out of both of them.
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Old 11-19-2019, 11:03 AM   #4
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Given that there is only one pipe entering the back box then I would say yes. You should expect exhaust fumes out of both of them.
You would be incorrect.

The 'golf tee' mod opens both exhaust pipes full time. Google 'golf tee mod' for more info.
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Last edited by All2kool; 11-19-2019 at 11:07 AM.
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Old 11-19-2019, 11:24 AM   #5
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Does the OP 325 even have the exhaust flap?
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Old 11-19-2019, 11:39 AM   #6
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You would be incorrect.

The 'golf tee' mod opens both exhaust pipes full time. Google 'golf tee mod' for more info.
The golf tee mod. Is that stock? Or is it a modification? I have a haynes manual. It shows a single pipe into the back box.

EDIT: But I have just checked realoem for my 2.2 an it shows two pipes. So you are right.

Last edited by RayPooley; 11-19-2019 at 11:47 AM.
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Old 11-19-2019, 11:43 AM   #7
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The golf tee mod. Is that stock? Or is it a modification?
The flap is operated closed by vacuum. By default, the flap is open. At WOT, no vacuum and the flap is open, as soon as the car returns to closed throttle, vacuum closes the flap. The golf tee mod simply plugs the vacuum hose to the flap and the flap remains open all the time.
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Old 11-19-2019, 11:46 AM   #8
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The flap is operated closed by vacuum. By default, the flap is open. At WOT, no vacuum and the flap is open, as soon as the car returns to closed throttle, vacuum closes the flap. The golf tee mod simply plugs the vacuum hose to the flap and the flap remains open all the time.
So thats none stock?
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Old 11-19-2019, 12:08 PM   #9
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So thats none stock?
No BMW part number on a golf tee so no, not stock.

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Old 11-19-2019, 02:32 PM   #10
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The golf tee mod. Is that stock? Or is it a modification?
Do you really think BMW engineers would actually put in a golf tee on every car?
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Old 11-19-2019, 03:07 PM   #11
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Do you really think BMW engineers would actually put in a golf tee on every car?

I think it's pretty clear from my comments so far that I have no idea what a "golf tee" is in this context so why not? There are several parts on these cars that have casual names: the "front aggregate protection plate" is often called the "belly pan". The "snorkel" above the radiator. The engineers see fit to put one on every car. Right?

However, since being made aware of the term I have looked it up. I may be wrong but it seems the primary purpose of this mod is to make more noise. Well, not being an adolescent who likes riding round making unnecessarily loud noises and disturbing the peace the "golf tee mod" is not something I would ever have come into contact with were it not for this revelation here today.
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Old 11-19-2019, 03:28 PM   #12
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I think it's pretty clear from my comments so far that I have no idea what a "golf tee" is in this context so why not? There are several parts on these cars that have casual names: the "front aggregate protection plate" is often called the "belly pan". The "snorkel" above the radiator. The engineers see fit to put one on every car. Right?

However, since being made aware of the term I have looked it up. I may be wrong but it seems the primary purpose of this mod is to make more noise. Well, not being an adolescent who likes riding round making unnecessarily loud noises and disturbing the peace the "golf tee mod" is not something I would ever have come into contact with were it not for this revelation here today.
Aw, Ray, don't be so negative

I have done this mod. Super easy (yes you are literally closing off the vacuum line with a golf tee) and it takes 5 minutes to do. IMO it doesn't make the vehicle exhaust more 'noisy' at idle; it does add a little more tone to the exhaust under light to medium acceleration (under heavy acceleration the port flap would be opened anyway, so no difference there).

Personally, having a convertible - I enjoy hearing just a tad bit more of an exhaust that no longer sounds like a late 90's Honda Accord at anything less than full throttle... Just saying.
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Old 11-19-2019, 03:29 PM   #13
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Personally, having a convertible - I enjoy hearing just a tad bit more of an exhaust that no longer sounds like a late 90's Honda Accord at anything less than full throttle... Just saying.
ZHP muffler FTW!
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Last edited by Overboost; 11-19-2019 at 03:30 PM.
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Old 11-19-2019, 03:50 PM   #14
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The golf tee mod. Is that stock? Or is it a modification? I have a haynes manual. It shows a single pipe into the back box.
You just answered it yourself
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Old 11-19-2019, 04:04 PM   #15
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You just answered it yourself
The first question was rhetorical.
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Old 11-19-2019, 04:44 PM   #16
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I think it's pretty clear from my comments so far that I have no idea what a "golf tee" is in this context so why not? There are several parts on these cars that have casual names: the "front aggregate protection plate" is often called the "belly pan". The "snorkel" above the radiator. The engineers see fit to put one on every car. Right?

However, since being made aware of the term I have looked it up. I may be wrong but it seems the primary purpose of this mod is to make more noise. Well, not being an adolescent who likes riding round making unnecessarily loud noises and disturbing the peace the "golf tee mod" is not something I would ever have come into contact with were it not for this revelation here today.
The M54B22 is the only six-cylinder E46 without the exhaust flap, so can't blame you for not knowing. Always liked that about my 320Ci.
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Old 11-19-2019, 04:52 PM   #17
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The M54B22 is the only six-cylinder E46 without the exhaust flap, so can't blame you for not knowing. Always liked that about my 320Ci.
My 2002 325i M54B25 did not have the flap or hoses on the factory muffler. I replaced it with a ZHP muffler and they have no flap either.
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Last edited by Overboost; 11-19-2019 at 04:53 PM.
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Old 11-19-2019, 04:57 PM   #18
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My 2002 325i M54B25 did not have the flap or hoses on the factory muffler. I replaced it with a ZHP muffler and they have no flap either.
Ah really? Maybe I was a little gung ho in my comment.
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Old 11-19-2019, 05:01 PM   #19
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Ah really? Maybe I was a little gung ho in my comment.
I think it was a 330 thing. It may well be a USA destination thing too

I guess the engineers didn't think the 2.5 liter made enough sound to warrant the flap...
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Last edited by Overboost; 11-19-2019 at 05:04 PM.
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Old 11-19-2019, 06:28 PM   #20
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ZHP muffler FTW!
Is the ZHP muffler different?
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