OEM exhaust mod plus valve flaps open

BigMacSmallFries · 11-19-2014, 10:09 PM

I removed the connection to the valves last week. Car sounds a lot beefier below 3000rpm. Not much louder to be honest but a lot deeper at lower RPM. Should have come from the factory this way. Sounds like a 4.0L I6 instead of a 3 liter if you know what I mean.

Regardless of aftermarket exhaust, none of them seem too appealing to me. Turbos have really taken the fun out of that. I'd rather have the perforated pipes changed with solid pipes again on this model. Anyone do this yet, and did the exhaust get noticeably louder? I know the valve allows the gases to exit directly, but half the gases are still flowing through the center exhaust. Any incite would be appreciated.

Please spare me the merits of purchasing an aftermarket exhaust vs doing this.

jc1654M4 · 11-19-2014, 10:43 PM

Hey did you put the car on a lift to remove ? And it's like a little clip that you have to
Press to get them unplugged right ?

BigMacSmallFries · 11-19-2014, 10:52 PM

Quote:

Originally Posted by jc1654M4

Hey did you put the car on a lift to remove ? And it's like a little clip that you have to
Press to get them unplugged right ?

It's very easy to do. Just lie down on your back and get a thin flat head screw driver and wedge it between the socket and the connector on the TOP portion of where it plugs in. Pull somewhat hard. Have duct tape/electrical tape handy to wrap both ends to keep from getting clogging up from debris on the road. Well worth it.

Oh, before you begin grab your iPhone and shine the light into the tailpipe. Make sure the valves are open! If it is closed, it will stay closed after you disconnect it. I did it first with the valves closed and it was quiet. Had to reconnect the valves and redo it a second time. Takes 10 minutes to do both sides the first time, not even 5 the second time.

Jay1994 · 11-19-2014, 10:53 PM

Quote:

Originally Posted by jc1654M4

Hey did you put the car on a lift to remove ? And it's like a little clip that you have to
Press to get them unplugged right ?

Yes that's all you need to do. It's quoted in this thread http://f80.bimmerpost.com/forums/sho....php?t=1006077

jc1654M4 · 11-19-2014, 11:06 PM

Quote:

Originally Posted by BigMacSmallFries

Quote:

Originally Posted by jc1654M4

Hey did you put the car on a lift to remove ? And it's like a little clip that you have to
Press to get them unplugged right ?

It's very easy to do. Just lie down on your back and get a thin flat head screw driver and wedge it between the socket and the connector on the TOP portion of where it plugs in. Pull somewhat hard. Have duct tape/electrical tape handy to wrap both ends to keep from getting clogging up from debris on the road. Well worth it.

Oh, before you begin grab your iPhone and shine the light into the tailpipe. Make sure the valves are open! If it is closed, it will stay closed after you disconnect it. I did it first with the valves closed and it was quiet. Had to reconnect the valves and redo it a second time. Takes 10 minutes to do both sides the first time, not even 5 the second time.

Thank you very much brother. I'm going to do it tomorrow. I have a little bit of trouble fitting under the car because it's lowered and well I'm not small in stature to put it bluntly lol. Hopefully the picture attached but you stick the flat head in on the side that the cables are coming from right ?

BigMacSmallFries · 11-19-2014, 11:12 PM

No problem. You see the top of the connection where there that plastic tab is? Place the flat head bit in-between. You can you feel with your finger where the tab flexes upwards. Then pull hard while holding the top and bottom of it with your fingers. Will be easy the second time you do it.

NorCal f80 · 11-19-2014, 11:27 PM

Question is, how do you open the valves prior to pulling the plug?

dmk08 · 11-20-2014, 06:21 AM

Quote:

Originally Posted by 0-100 nga real quick

Question is, how do you open the valves prior to pulling the plug?

Sport plus?

Jay1994 · 11-20-2014, 10:40 AM

Quote:

Originally Posted by 0-100 nga real quick

Question is, how do you open the valves prior to pulling the plug?

You're suppose to drive and get the car warm in sports mode(10 min ish drive) turn the car off in sports mode and the valves should be open then pull the plug.

jc1654M4 · 11-20-2014, 12:30 PM

Quote:

Originally Posted by BigMacSmallFries

No problem. You see the top of the connection where there that plastic tab is? Place the flat head bit in-between. You can you feel with your finger where the tab flexes upwards. Then pull hard while holding the top and bottom of it with your fingers. Will be easy the second time you do it.

Dude I did it this morning thank you for the tip! Haven't been able to drive it yet and listen but I'm sure it's an improvement
Thanks again !

rutiger · 11-20-2014, 01:35 PM

Quote:

Originally Posted by Jay1994

Quote:

Originally Posted by 0-100 nga real quick

Question is, how do you open the valves prior to pulling the plug?

You're suppose to drive and get the car warm in sports mode(10 min ish drive) turn the car off in sports mode and the valves should be open then pull the plug.

The valve is open when car is off. So just unplug while car is off. Process takes a minute total.

TahoeM3 · 11-20-2014, 01:42 PM

I tried unsuccessfully to get them off last week and ended up shredding my hands in the process. It's very tricky to get to without the car lifted because it's a very tight space, and the edges of the underbody shielding are very sharp, so watch out. I'm going to try again, but with gloves this time!

rsquare · 11-21-2014, 02:27 PM

By doing this does it leave an error light on the dash? If so is there any way to turn it off?

LukasAT · 11-21-2014, 02:38 PM

Quote:

Originally Posted by rsquare

By doing this does it leave an error light on the dash? If so is there any way to turn it off?

there wont be an error code on the dash but it will save an error code in the system that the valve system is not working ... had the same on my Z4. Just unplug it ..

Zu · 11-21-2014, 10:10 PM

did it last night , made a HUGE difference in cold start in a good way , i think the tip is to actually to use your fingernail and press the small rectangular piece and then pull with the other hand

bgreen4544 · 11-21-2014, 10:33 PM

Quote:

Originally Posted by LukasAT

Quote:

Originally Posted by rsquare

By doing this does it leave an error light on the dash? If so is there any way to turn it off?

there wont be an error code on the dash but it will save an error code in the system that the valve system is not working ... had the same on my Z4. Just unplug it ..

Will it leave the yellow exclamation point on the instrument panel?

Zu · 11-22-2014, 01:54 AM

Quote:

Originally Posted by bgreen4544

Will it leave the yellow exclamation point on the instrument panel?

Nope , didn't get any for mine

BigMacSmallFries · 11-22-2014, 10:23 AM

Just listened to video comparing the OEM exhaust with the M Performance one. Here: http://f80.bimmerpost.com/forums/sho....php?t=1061040

1st is OEM with valves closed, 2nd is OEM with valves open, 3rd is MPE with valves closed, and 4th is MPE with valves open.

As you can see the sound signature is similar across the board for the two exhaust, but as you listen to the four different exhaust sounds it becomes more raspy and angry sounding.

I think doing the perforated exhaust mod to decrease sound reduction for half the gases flowing into the center exhaust we will end up with a sound identical to the performance exhaust. We just need a guinea pig to volunteer to do it. Anyone up for it? Would be nice to hear.

EDIT: Btw, the cold start up is LOUD with the open valve mod done. Louder than the E9x M3 with the exhaust mod.

E92LNGCGY · 11-22-2014, 12:28 PM

I just completed this mod. Cold start is so much louder. Even when warmed up it is still louder than with valves closed. I found it a bit tricky getting the right hand side plug removed but other than that it is well worth the time.

bgreen4544 · 11-23-2014, 11:38 AM

Got this going as well, sounds pretty good.

JCN83 · 11-23-2014, 04:54 PM

Pumped! Didn't know this mod existed until I read this thread tonight.

Ran out to the garage a few minutes ago and knocked this out in about 25 minutes (including electrical taping and wire-tying things up). Just started it up and it sounds awesome. You can cycle through the M1 and M2 maps and now there is no difference in exhaust note - even from Efficient mode to M2. Very pleased. Now to take it for a longer spin and check for drone.

Super excited so far.

Thanks for the writeup!

schummiking · 11-30-2014, 04:13 PM

Does this lead to any loss in performance? e.g. loss of torque in low rev range?

11-19-2014, 10:09 PM	#1
BigMacSmallFries First Lieutenant 123 Rep 353 Posts Drives: '19 M5C 911 Turbo F430 GT3 RS Join Date: Aug 2010 Location: N/A iTrader: (1)	OEM exhaust mod plus valve flaps open I removed the connection to the valves last week. Car sounds a lot beefier below 3000rpm. Not much louder to be honest but a lot deeper at lower RPM. Should have come from the factory this way. Sounds like a 4.0L I6 instead of a 3 liter if you know what I mean. Regardless of aftermarket exhaust, none of them seem too appealing to me. Turbos have really taken the fun out of that. I'd rather have the perforated pipes changed with solid pipes again on this model. Anyone do this yet, and did the exhaust get noticeably louder? I know the valve allows the gases to exit directly, but half the gases are still flowing through the center exhaust. Any incite would be appreciated. Please spare me the merits of purchasing an aftermarket exhaust vs doing this.
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11-19-2014, 10:43 PM	#2
jc1654M4 First Lieutenant 56 Rep 340 Posts Drives: 2015 Black M4 Join Date: Feb 2014 Location: miami,fl iTrader: (0)	Hey did you put the car on a lift to remove ? And it's like a little clip that you have to Press to get them unplugged right ?
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11-19-2014, 11:12 PM	#6
BigMacSmallFries First Lieutenant 123 Rep 353 Posts Drives: '19 M5C 911 Turbo F430 GT3 RS Join Date: Aug 2010 Location: N/A iTrader: (1)	No problem. You see the top of the connection where there that plastic tab is? Place the flat head bit in-between. You can you feel with your finger where the tab flexes upwards. Then pull hard while holding the top and bottom of it with your fingers. Will be easy the second time you do it.
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11-19-2014, 11:27 PM	#7
NorCal f80 Lieutenant Colonel 346 Rep 1,656 Posts Drives: M3 Join Date: Apr 2014 Location: Nor Cal iTrader: (0)	Question is, how do you open the valves prior to pulling the plug?
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11-20-2014, 01:42 PM	#12
TahoeM3 Major 410 Rep 1,025 Posts Drives: F-type R, GTR, X5 50i Join Date: Apr 2006 Location: Tampa, Fl iTrader: (0)	I tried unsuccessfully to get them off last week and ended up shredding my hands in the process. It's very tricky to get to without the car lifted because it's a very tight space, and the edges of the underbody shielding are very sharp, so watch out. I'm going to try again, but with gloves this time! __________________ 2017 F-type SVR Black/black 2017 Nissan GTR Red/black 2022 BMW X5M MBB/SO Gone but not forgotten: '12 X5M, '07 AM SuperVantage, '05 Boxster S, '01 BMW M3,...
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11-21-2014, 02:27 PM	#13
rsquare New Member 1 Rep 27 Posts Drives: 2015 mineral grey m4 , 2017, x Join Date: Jul 2014 Location: nj iTrader: (0)	By doing this does it leave an error light on the dash? If so is there any way to turn it off?
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11-21-2014, 10:10 PM	#15
Zu Private First Class 167 Rep 117 Posts Drives: e92 m3 Join Date: Mar 2012 Location: Singapore iTrader: (0)	did it last night , made a HUGE difference in cold start in a good way , i think the tip is to actually to use your fingernail and press the small rectangular piece and then pull with the other hand
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11-22-2014, 10:23 AM	#18
BigMacSmallFries First Lieutenant 123 Rep 353 Posts Drives: '19 M5C 911 Turbo F430 GT3 RS Join Date: Aug 2010 Location: N/A iTrader: (1)	Just listened to video comparing the OEM exhaust with the M Performance one. Here: http://f80.bimmerpost.com/forums/sho....php?t=1061040 1st is OEM with valves closed, 2nd is OEM with valves open, 3rd is MPE with valves closed, and 4th is MPE with valves open. As you can see the sound signature is similar across the board for the two exhaust, but as you listen to the four different exhaust sounds it becomes more raspy and angry sounding. I think doing the perforated exhaust mod to decrease sound reduction for half the gases flowing into the center exhaust we will end up with a sound identical to the performance exhaust. We just need a guinea pig to volunteer to do it. Anyone up for it? Would be nice to hear. EDIT: Btw, the cold start up is LOUD with the open valve mod done. Louder than the E9x M3 with the exhaust mod.
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11-22-2014, 12:28 PM	#19
E92LNGCGY Lieutenant Colonel 439 Rep 1,732 Posts Drives: F97/Q5/982 GT4 Join Date: Jan 2011 Location: Canada iTrader: (0)	I just completed this mod. Cold start is so much louder. Even when warmed up it is still louder than with valves closed. I found it a bit tricky getting the right hand side plug removed but other than that it is well worth the time.
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11-23-2014, 11:38 AM	#20
bgreen4544 Private 13 Rep 85 Posts Drives: 2014 X5 F15, M4 F82 Join Date: Jul 2014 Location: VA iTrader: (0)	Got this going as well, sounds pretty good.
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11-23-2014, 04:54 PM	#21
JCN83 Private First Class 30 Rep 173 Posts Drives: 2013 M3 Join Date: May 2008 Location: USA iTrader: (0)	Pumped! Didn't know this mod existed until I read this thread tonight. Ran out to the garage a few minutes ago and knocked this out in about 25 minutes (including electrical taping and wire-tying things up). Just started it up and it sounds awesome. You can cycle through the M1 and M2 maps and now there is no difference in exhaust note - even from Efficient mode to M2. Very pleased. Now to take it for a longer spin and check for drone. Super excited so far. Thanks for the writeup! __________________ 2019 GT3 RS
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11-30-2014, 04:13 PM	#22
schummiking New Member 17 Rep 22 Posts Drives: G87/G05 X5 M50i/F80(Sold) Join Date: Nov 2014 Location: Texas iTrader: (0)	Does this lead to any loss in performance? e.g. loss of torque in low rev range?
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