Any M6 or M6 GC owners actually performed the exhaust valve mod?

Flying Ace · 12-15-2017, 07:45 PM

I need tips on how to access the controller solenoid.

I adjusted my tips today, and I saw that the solenoid for the flapper is way on the outer pipe and nestled against the corner of the bumper. I removed the outer tip and barely could put my hand up on it, let alone string a piece of wire and tie it. Almost seems like you need to unbolt the exhaust and let it hang down and do the mod, or remove the bumper.

I looked at pics of the M5, and that car has way more room to work under the bumper than the GC. Like literally I had to take a second to find the solenoid bc it was hiding behind the bumper.

Any tips? I approached this with the car flat on the ground and from behind. Do I actually need to be under the car and looking it downstream to access it?

Btw I have the Akra MPE. But should be the same as OEM

BMWDriverX · 12-16-2017, 01:55 AM

I went with Exhaust Meister. You plug it into the trunk behind the driver side carpet and then you can set up your mirror home link buttons to open/close the flaps. It comes with 2 remotes as well and I think it's around $120 or so.

malcoll · 12-16-2017, 12:15 PM

I did this mod on my M6GC... it's definitely a tad louder on start up.... but the exhaust is still a bit "mild".... I am off the next two weeks and seriously considering building a muffler delete and install........

Flying Ace · 12-16-2017, 02:00 PM

Quote:

Originally Posted by malcoll

I did this mod on my M6GC... it's definitely a tad louder on start up.... but the exhaust is still a bit "mild".... I am off the next two weeks and seriously considering building a muffler delete and install........

I'm unsure if I want to do the mod now. As you said, it'll be the same sound you get at startup, just the entire time.

Flying Ace · 12-17-2017, 12:15 AM

Got 'er done. Definitely had to get all the way under to perform the work

BMWRog · 12-17-2017, 10:48 AM

Agree with Malcoll. My M6 is bog standard, apart from the exhaust valve mod. Marginally more sound on cold startup, but not really much difference once running. I've also disconnected the ASD unit, so now I can hear the REAL sound! Much better...

mjposner · 12-18-2017, 05:58 PM

I did this with car on ground. Use a long screwdriver to push valve open, I used top plastic tie straps to hold open. A little louder at idle and start-up, but not loud on the go

Flying Ace · 12-18-2017, 07:40 PM

Quote:

Originally Posted by mjposner

I did this with car on ground. Use a long screwdriver to push valve open, I used top plastic tie straps to hold open. A little louder at idle and start-up, but not loud on the go

I haven't driven the car with the mod yet. If not real difference, then I'll probably just revert it back.

Evil Derboy · 12-21-2017, 05:11 AM

Quote:

Originally Posted by Flying Ace

I haven't driven the car with the mod yet. If not real difference, then I'll probably just revert it back.

I did mine with circlips instead of using plastic. Definitely louder on cold start and lower revs. No difference at higher revs. Main benefit for me is that the car sounds much more throaty at lower revs when pootling about around town but at higher revs the flaps would open anyway so no real difference.

Seeing as it's a very cheap and simple mod it's definitely worthwhile doing to see if you like it. Easy enough to change back.

kris1858 · 12-21-2017, 09:52 PM

Quote:

Originally Posted by SoCalM6GC

I went with Exhaust Meister. You plug it into the trunk behind the driver side carpet and then you can set up your mirror home link buttons to open/close the flaps. It comes with 2 remotes as well and I think it's around $120 or so.

Same here... However to get the most out of the cold start, just replace your OEM downpipes with high flow non-catted downpipes.

Flying Ace · 12-21-2017, 10:05 PM

Next time I'm under the car, I'm going to reve this mod.

Duff Ace · 12-22-2017, 06:28 PM

Flying Ace, not seeing much of a difference ?

I also did the exhaustmeister and love it.

markymarc1979 · 12-22-2017, 08:03 PM

Love those tips. Pure sex. Any chance you know the inlet and outlet size of those?

Flying Ace · 12-22-2017, 08:41 PM

Quote:

Originally Posted by markymarc1979

Love those tips. Pure sex. Any chance you know the inlet and outlet size of those?

Sorry, I don't have those CF tips. Someone else said the Akra is a 67mm inlet. I cannot confirm.

Airz · 12-24-2017, 05:52 AM

Did the valve mod on my stock exhaust but I do a lot of 5 hour motorway journeys and the extra noise got on my nerves by the 3rd hour so put it back to stock

malcoll · 12-24-2017, 10:16 AM

Did you deactivate the ASD? Before doing that the drone was almost unbearable, with ASD off, I like it and actually am considering the Muffler Delete......

Airz · 12-24-2017, 10:28 AM

No I didn't and at motorway speeds the drone was driving me crazy. If it was the ASD "enhancing" the noise I'll give disabling that a try as I definitely prefer the sound of the car with the valve mod.

Flying Ace · 12-24-2017, 11:03 AM

Quote:

Originally Posted by Airz

Did the valve mod on my stock exhaust but I do a lot of 5 hour motorway journeys and the extra noise got on my nerves by the 3rd hour so put it back to stock

Quote:

Originally Posted by malcoll

Did you deactivate the ASD? Before doing that the drone was almost unbearable, with ASD off, I like it and actually am considering the Muffler Delete......

I did an extended drive myself yesterday. I have the MPE/Akra and the drone was loud. Not sure if related to this mod. And my ASD has been removed.

12-15-2017, 07:45 PM	#1
Flying Ace Lieutenant General 4985 Rep 11,891 Posts Drives: G05 45e, 997.1 & 991.1 GT3s Join Date: Jul 2014 Location: SF, CA iTrader: (5)	Any M6 or M6 GC owners actually performed the exhaust valve mod? I need tips on how to access the controller solenoid. I adjusted my tips today, and I saw that the solenoid for the flapper is way on the outer pipe and nestled against the corner of the bumper. I removed the outer tip and barely could put my hand up on it, let alone string a piece of wire and tie it. Almost seems like you need to unbolt the exhaust and let it hang down and do the mod, or remove the bumper. I looked at pics of the M5, and that car has way more room to work under the bumper than the GC. Like literally I had to take a second to find the solenoid bc it was hiding behind the bumper. Any tips? I approached this with the car flat on the ground and from behind. Do I actually need to be under the car and looking it downstream to access it? Btw I have the Akra MPE. But should be the same as OEM __________________ 22 Phytonic/Coffee X5 45e (CoVID-free) 08 Speed Yellow 911 GT3 Sharkwerks 12 AW/Cinnamon X5d Sports Pkg (retired) 14 AW/Beige M6GC ZCP, MPE, V2 steering wheel, vorsteiner (retired) 08 SSII/Black E90 M3 (retired) Last edited by Flying Ace; 12-15-2017 at 09:47 PM..
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12-16-2017, 01:55 AM	#2
BMWDriverX Captain 366 Rep 804 Posts Drives: G12 750i X-Drive Join Date: Jul 2017 Location: CA iTrader: (1)	I went with Exhaust Meister. You plug it into the trunk behind the driver side carpet and then you can set up your mirror home link buttons to open/close the flaps. It comes with 2 remotes as well and I think it's around $120 or so.
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12-16-2017, 12:15 PM	#3
malcoll Private First Class 23 Rep 110 Posts Drives: 2014 M6GC BSM/SO Join Date: Jul 2017 Location: Florida iTrader: (0)	I did this mod on my M6GC... it's definitely a tad louder on start up.... but the exhaust is still a bit "mild".... I am off the next two weeks and seriously considering building a muffler delete and install........
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12-17-2017, 12:15 AM	#5
Flying Ace Lieutenant General 4985 Rep 11,891 Posts Drives: G05 45e, 997.1 & 991.1 GT3s Join Date: Jul 2014 Location: SF, CA iTrader: (5)	Got 'er done. Definitely had to get all the way under to perform the work Attached Images __________________ 22 Phytonic/Coffee X5 45e (CoVID-free) 08 Speed Yellow 911 GT3 Sharkwerks 12 AW/Cinnamon X5d Sports Pkg (retired) 14 AW/Beige M6GC ZCP, MPE, V2 steering wheel, vorsteiner (retired) 08 SSII/Black E90 M3 (retired)
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12-17-2017, 10:48 AM	#6
BMWRog Private First Class 19 Rep 126 Posts Drives: 2014 M6 Convertible Join Date: Feb 2017 Location: Oxfordshire, U.K. iTrader: (0)	Agree with Malcoll. My M6 is bog standard, apart from the exhaust valve mod. Marginally more sound on cold startup, but not really much difference once running. I've also disconnected the ASD unit, so now I can hear the REAL sound! Much better...
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12-18-2017, 05:58 PM	#7
mjposner Brigadier General 898 Rep 3,071 Posts Drives: 2020 Z4 40i Join Date: Mar 2011 Location: Southwest Florida iTrader: (3)	I did this with car on ground. Use a long screwdriver to push valve open, I used top plastic tie straps to hold open. A little louder at idle and start-up, but not loud on the go __________________ Previous BMW: 16 M4, 13 M6; 14 M235i, 12 BMW M3; 11 BMW M3; 08 BMW M3; 08 BMW Z4M; 04 X3; 02 M3 Convertible; 02 M3; 00 M Roadster; 94 325 convertible; 92 325i Convertible; and 85 635csi My Car Photo Blog: http://carfisheye.blogspot.com/
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12-21-2017, 10:05 PM	#11
Flying Ace Lieutenant General 4985 Rep 11,891 Posts Drives: G05 45e, 997.1 & 991.1 GT3s Join Date: Jul 2014 Location: SF, CA iTrader: (5)	Next time I'm under the car, I'm going to reve this mod. __________________ 22 Phytonic/Coffee X5 45e (CoVID-free) 08 Speed Yellow 911 GT3 Sharkwerks 12 AW/Cinnamon X5d Sports Pkg (retired) 14 AW/Beige M6GC ZCP, MPE, V2 steering wheel, vorsteiner (retired) 08 SSII/Black E90 M3 (retired)
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12-22-2017, 06:28 PM	#12
Duff Ace Adam 124 Rep 269 Posts Drives: Lusso, GT3, 360, Vaquish, bike Join Date: Nov 2017 Location: Tampa, FL iTrader: (0) Garage List 2021 Jeep Gladiator [0.50] 2004 Ferrari 360 Sp ... [0.00] 2014 Aston Martin V ... [0.00] 2014 Porsche 911 GT3 [10.00] 2017 Ferrari GTC4 L ... [10.00]	Flying Ace, not seeing much of a difference ? I also did the exhaustmeister and love it.
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12-22-2017, 08:03 PM	#13
markymarc1979 Banned 268 Rep 2,534 Posts Drives: 16 G12 + 15 F06 + 17 F15 Join Date: Feb 2008 Location: Oakville, Ontario iTrader: (4) Garage List 2009 BMW E93 [0.00] 2012 BMW 750xi [0.00]	Love those tips. Pure sex. Any chance you know the inlet and outlet size of those?
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12-24-2017, 05:52 AM	#15
Airz Private 11 Rep 51 Posts Drives: 2015 M6 Sakhir Coupe Join Date: Jun 2014 Location: United Kingdom iTrader: (0)	Did the valve mod on my stock exhaust but I do a lot of 5 hour motorway journeys and the extra noise got on my nerves by the 3rd hour so put it back to stock
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12-24-2017, 10:16 AM	#16
malcoll Private First Class 23 Rep 110 Posts Drives: 2014 M6GC BSM/SO Join Date: Jul 2017 Location: Florida iTrader: (0)	Did you deactivate the ASD? Before doing that the drone was almost unbearable, with ASD off, I like it and actually am considering the Muffler Delete......
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12-24-2017, 10:28 AM	#17
Airz Private 11 Rep 51 Posts Drives: 2015 M6 Sakhir Coupe Join Date: Jun 2014 Location: United Kingdom iTrader: (0)	No I didn't and at motorway speeds the drone was driving me crazy. If it was the ASD "enhancing" the noise I'll give disabling that a try as I definitely prefer the sound of the car with the valve mod.
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