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      12-24-2014, 11:25 PM   #1
rocky
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M5 Exhaust flapper mod demonstrated



I have experimented with keeping the exhaust valves open on a new 2015 M5 w/ stock exhaust and I feel the difference is worth it to keep. Please view yourself and come to your own conclusion.
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      12-25-2014, 12:07 AM   #2
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I know others will think otherwise and will want louder, but I think that sounds really good! I'm going from an E92 to this bohemoth because I need the space, but don't want to give up my youth quite yet, lol. So, did you wire your exhaust valves or get the Exhaustmeister thing?
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      12-25-2014, 12:11 AM   #3
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Quote:
Originally Posted by bronch View Post
I know others will think otherwise and will want louder, but I think that sounds really good! I'm going from an E92 to this bohemoth because I need the space, but don't want to give up my youth quite yet, lol. So, did you wire your exhaust valves or get the Exhaustmeister thing?

it took about five minutes to wire the valve open.....it normally stays closed until you get to about 3500 rpm and then opens for the brief time you drive in that rpm range. I was very impressed with the exhaust note and NO DRONE !!
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      12-25-2014, 01:20 AM   #4
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Quote:
Originally Posted by rocky View Post
it took about five minutes to wire the valve open.....it normally stays closed until you get to about 3500 rpm and then opens for the brief time you drive in that rpm range. I was very impressed with the exhaust note and NO DRONE !!
I like it and you may have saved just saved me $9K, so thank you
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      12-25-2014, 01:31 AM   #5
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Delete Resonators for s little more fun
Still no drone
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      12-25-2014, 02:16 AM   #6
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Man instead of Akrapovic exhaust, I can spend that $9k on getting Vorsteiner carbon fiber lip because they make the best one hands down (my opinion).

Anyone know if you get Carbon Fiber tips to just put over the M5 stock exhaust?
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      12-25-2014, 03:53 AM   #7
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Quote:
Originally Posted by bronch View Post
I like it and you may have saved just saved me $9K, so thank you
yup...unless u want to wake up the neighbors, this cheap mod not only sounds good but saves tons of money.... i get tons of compliments on the exhaust tone.
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      12-25-2014, 03:54 AM   #8
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Originally Posted by soooma View Post
Delete Resonators for s little more fun
Still no drone
deleting the resonators?? how much louder will the exhaust be ? Is that what you did ? any sound bytes ?
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      12-25-2014, 04:29 AM   #9
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What kind of wire did you use? Will heavy duty zip ties work also?

Sounds great... a lot better than when valves are closed for sure.
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      12-25-2014, 12:45 PM   #10
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Quote:
Originally Posted by HXS
What kind of wire did you use? Will heavy duty zip ties work also?

Sounds great... a lot better than when valves are closed for sure.
Can you get heat resistant zip ties?
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      12-25-2014, 04:28 PM   #11
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Sounds great. with larger size tips, you will be set!
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      12-25-2014, 07:52 PM   #12
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i used home depot size 12 (i think) stainless wire.....very simple
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      12-25-2014, 07:53 PM   #13
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zip ties wont be strong enough
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      12-26-2014, 03:15 AM   #14
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I did mine with zip ties yesterday...will find out soon if they can resist the heat...I have catless Downpipes and stock exhaust...the sound is great in idle, revving, and low speed
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      12-26-2014, 09:10 AM   #15
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Quote:
Originally Posted by falsalem
I did mine with zip ties yesterday...will find out soon if they can resist the heat...I have catless Downpipes and stock exhaust...the sound is great in idle, revving, and low speed
I've still yet to hear the stock exhaust combined with catless downpipes. I'm so intrigued by that setup. No one has made any video of that yet.
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      12-26-2014, 11:09 AM   #16
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Quote:
Originally Posted by RPiM5
Quote:
Originally Posted by falsalem
I did mine with zip ties yesterday...will find out soon if they can resist the heat...I have catless Downpipes and stock exhaust...the sound is great in idle, revving, and low speed
I've still yet to hear the stock exhaust combined with catless downpipes. I'm so intrigued by that setup. No one has made any video of that yet.
Will post a vid tomorrow...
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      12-26-2014, 11:25 AM   #17
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Quote:
Originally Posted by falsalem
Quote:
Originally Posted by RPiM5
Quote:
Originally Posted by falsalem
I did mine with zip ties yesterday...will find out soon if they can resist the heat...I have catless Downpipes and stock exhaust...the sound is great in idle, revving, and low speed
I've still yet to hear the stock exhaust combined with catless downpipes. I'm so intrigued by that setup. No one has made any video of that yet.
Will post a vid tomorrow...
Sweet!
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      12-26-2014, 12:25 PM   #18
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Quote:
Originally Posted by RPiM5
Quote:
Originally Posted by falsalem
Quote:
Originally Posted by RPiM5
Quote:
Originally Posted by falsalem
I did mine with zip ties yesterday...will find out soon if they can resist the heat...I have catless Downpipes and stock exhaust...the sound is great in idle, revving, and low speed
I've still yet to hear the stock exhaust combined with catless downpipes. I'm so intrigued by that setup. No one has made any video of that yet.
Will post a vid tomorrow...
Sweet!
Thanks for posting this video. The one I posted exhaustmeister and Noelle 400 cell DPs with comp pkg. exhaust was not that good and did not get a great response.

Keeping the valves open IMO really helps the exhaust note for these vehicles as so much of our driving is stop and go and so much of the vehicles life is spent at these lower RPMs.

The after market exhausts like E Race, Akra etc I'm sure are better but also very pricey. I chose to put the $$ toward the DPs for both better sound quality and extra HP
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      12-27-2014, 06:22 AM   #19
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Quote:
Originally Posted by RPiM5 View Post
Sweet!
So this is what it sounds like with OEM Exhaust (Flaps held open with zip ties) and Catless Downpipes (Gintani)...I like it so far...Will upload videos of some drive-bys later this week...


Last edited by falsalem; 12-27-2014 at 08:35 AM.
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      12-27-2014, 08:21 AM   #20
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I just noticed that the zip ties had come loose before recording the video. I'll try keeping the valves open and record another video later this week.

Last edited by falsalem; 12-27-2014 at 08:36 AM.
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      12-27-2014, 10:52 AM   #21
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Sounds good bro. I like this. The one diff I can tell is there is lil to no turbo whine compared to our aftermarket exhaust. Still sounds mean
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      12-27-2014, 02:16 PM   #22
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Gents - I had my exhaust valves tied open earlier in the summer and the extra sound is just about right. Sounds a bit more aggressive. Just used some medium grade wire and it has been solid. It is worthwhile.
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