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Author Topic: Exhaust Flap thingamabob  (Read 981 times)

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Offline Mikie

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Exhaust Flap thingamabob
« on: November 01, 2018, 11:42:19 am »
I have seen a few guys removing the exhaust flap goodie on the 2010 models up

Is there any benefit to doing this?
Any Cons?

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Offline Ganjora

Re: Exhaust Flap thingamabob
« Reply #1 on: November 01, 2018, 11:50:32 am »
lightens the bike and thus makes it faster.
 

Offline Mikie

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Re: Exhaust Flap thingamabob
« Reply #2 on: November 01, 2018, 11:55:56 am »
lightens the bike and thus makes it faster.

With or without racing stripes??
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Online katana

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Re: Exhaust Flap thingamabob
« Reply #3 on: November 01, 2018, 12:13:57 pm »
I have seen a few guys removing the exhaust flap goodie on the 2010 models up

Is there any benefit to doing this?
Any Cons?
They say more mid and top, but the bottom power suffers.  I would rather remove the CAT if you want a more unrestricted exhaust.  The 2010+ GS' had open end cans anyway.
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Offline Mikie

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Re: Exhaust Flap thingamabob
« Reply #4 on: November 01, 2018, 12:18:34 pm »
I have seen a few guys removing the exhaust flap goodie on the 2010 models up

Is there any benefit to doing this?
Any Cons?
They say more mid and top, but the bottom power suffers.  I would rather remove the CAT if you want a more unrestricted exhaust.  The 2010+ GS' had open end cans anyway.
CAT is long gone, was wondering about this part though, guessing it makes the bike louder
:paw:

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Online katana

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Re: Exhaust Flap thingamabob
« Reply #5 on: November 01, 2018, 12:37:51 pm »
Just internet knowledge unfortunately, but the exhaust flap serves two purposes:  Back pressure and sound reduction off idle.  I guess it would be louder.
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Re: Exhaust Flap thingamabob
« Reply #6 on: November 01, 2018, 12:42:37 pm »
 exhaust flap goodie

Op n dag in Sutherland by die garage staan twee van die locals een van daai modelle en bekyk. Ek gooi oor en die bespreking draai om die kabels wat na en van die exhuast loop. Ek staan nader en lig hulle in dis die bike se exhuast brake.
Die manne was erg impressed dat die bike n exhuast brake gehad het!! :lol8:
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Re: Exhaust Flap thingamabob
« Reply #7 on: November 01, 2018, 01:27:32 pm »
exhaust flap goodie

Op n dag in Sutherland by die garage staan twee van die locals een van daai modelle en bekyk. Ek gooi oor en die bespreking draai om die kabels wat na en van die exhuast loop. Ek staan nader en lig hulle in dis die bike se exhuast brake.
Die manne was erg impressed dat die bike n exhuast brake gehad het!! :lol8:
:imaposer: :imaposer: :imaposer:
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Offline Mikie

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Re: Exhaust Flap thingamabob
« Reply #8 on: November 01, 2018, 01:48:37 pm »
 :laughing4: :laughing4: :laughing4:
:paw:

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Re: Exhaust Flap thingamabob
« Reply #9 on: November 30, 2018, 03:09:38 pm »
Just internet knowledge unfortunately, but the exhaust flap serves two purposes:  Back pressure and sound reduction off idle.  I guess it would be louder.

With you on this one Katana, apparently German standards for reducing noise in urban areas..... :ricky: :lol8:
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Re: Exhaust Flap thingamabob
« Reply #10 on: November 30, 2018, 03:43:03 pm »
Doesn't really help with a spirited pullaway then  ;)
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Offline Leo

Re: Exhaust Flap thingamabob
« Reply #11 on: November 30, 2018, 04:46:58 pm »
Ek staan nader en lig hulle in dis die bike se exhuast brake.
Die manne was erg impressed dat die bike n exhuast brake gehad het!! :lol8:

 :imaposer: :imaposer: :imaposer: :imaposer: :imaposer:

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Offline BlingKing

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Re: Exhaust Flap thingamabob
« Reply #12 on: January 07, 2019, 01:45:09 pm »
The flap was there to reduce the noise at lower RPM to help it pass the Euro IV emission tests.
I have taken out plenty of them (usually when I do the de-cat for them) the bike shows no fault (not like the LC) and I take out the whole unit motor and all.
It is replaced by a straight-thru piece of exhaust tubing.
Cannot feel much HP change in or out, but it does sound throatier at lower revs.
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Offline Battlestar

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Re: Exhaust Flap thingamabob
« Reply #13 on: January 11, 2019, 08:46:14 pm »
And backfires under compression. Took mine out of my 1200gs. Felt no difference in power etc only the back firing ocassionaly which was  actually quiet cool.
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Offline Brucet

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Re: Exhaust Flap thingamabob
« Reply #14 on: January 16, 2019, 09:54:39 pm »
Replaced my headers on my LC today with Akrapovic headers. (I know you are asking about the AC) The new headers don’t have a cat or a flap. The bike is a  bit louder but I can not tell any difference to the performance. It maybe a bit responsive though. I also have no warning lights on the dash.
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Offline Pavlovski

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Re: Exhaust Flap thingamabob
« Reply #15 on: January 25, 2019, 07:53:25 am »
I reckon since guys like Remus, Ackrapovic and Wunderlich (and these guys are BMW approved) sells systems without the exhaust flap.....means that it serves no purpose other than noise reduction.
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Offline Brucet

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Re: Exhaust Flap thingamabob
« Reply #16 on: January 25, 2019, 09:22:14 am »
Just a correction. According to my discussion with BMW Head office they are not BMW approved.

I have noticed no difference to the performance of my bike since removing the flap to fit the Akrapovic headers. In fact I actually think it is more responsive and so far seems lighter on fuel. - but that could be because the cat has been removed.
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Offline Pavlovski

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Re: Exhaust Flap thingamabob
« Reply #17 on: January 28, 2019, 08:08:08 am »
Just a correction. According to my discussion with BMW Head office they are not BMW approved.

I have noticed no difference to the performance of my bike since removing the flap to fit the Akrapovic headers. In fact I actually think it is more responsive and so far seems lighter on fuel. - but that could be because the cat has been removed.

Is it Akrapovic or Remus that's not BMW approved...or both? I had a BMW dealership order & fitting Remus and Akrapovic for me in the past. It would be strange if they do this for products that are not BMW approved :confused:
Or is it the removal of the butterfly thingy by means of fitting a full Remus/Akrapovic that's not BMW approved ???
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Offline Brucet

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Re: Exhaust Flap thingamabob
« Reply #18 on: January 28, 2019, 08:21:48 am »
I was told by head office and two branches that both exhausts are not BMW approved. Ridiculous I know. When I asked why they sell them then they basically said because people want them.
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Offline 73 Peanut

Re: Exhaust Flap thingamabob
« Reply #19 on: March 30, 2019, 05:37:07 pm »
Waste of time to remove the flap or the cat as there is no difference except it sounds louder . Not worth the time or effort .