M5 Exhaust flapper mod demonstrated

[variable229]

Originally Posted by rocky

deleting the resonators?? how much louder will the exhaust be ? Is that what you did ? any sound bytes ?

It's louder, just find a forum member competition package (resonators are deleted on comp pack exhaust).

[AshDrivesMs]

Wait so are these flaps on my 2013? And it doesn't screw up any electronics holding them in the open position?

[Propofoln]

Wonder how it would make stock CP M5 sound? Even better?

[oldrandomguy]

Originally Posted by AshDrivesMs

Wait so are these flaps on my 2013? And it doesn't screw up any electronics holding them in the open position?

Yes they are on your car. No it will not mess anything up when held open.

[AshDrivesMs]

Originally Posted by oldrandomguy

Yes they are on your car. No it will not mess anything up when held open.

Thanks. I wonder if there is a fuse that controls the exhaust valve. That would be even easier than tying the valve open.

[Butty45]

Originally Posted by AshDrivesMs

Thanks. I wonder if there is a fuse that controls the exhaust valve. That would be even easier than tying the valve open.

No. They are vacuum actuated. i.e the exhaust pressure pushes them open depending on throttle position etc...

[kenneth 1984]

I'm guessing this is a bad idea if the m5 is leased? Same goes for exhaustmeister?

[bronch]

Originally Posted by kenneth 1984

I'm guessing this is a bad idea if the m5 is leased? Same goes for exhaustmeister?

Why do think that? Both options can be easily reversed to stock. I see this as less intrusive to those that leased cars and bought after market exhausts that had to be cut and welded, then reversed at lease end.

[Propofoln]

Does the CP have these too?

[kenneth 1984]

I was just worried about the BMW Techs seeing that the vacuum based system has been permanently held open and this being logged into the onboard computer records?

[JOHNBMWM5]

Originally Posted by variable229

It's louder, just find a forum member competition package (resonators are deleted on comp pack exhaust).

My M6 GC Comp Pack is wired open, it sounds great all time time.

[(H)]

Sounds like a great idea, I am considering doing it as well. But can somebody actually enlighten me as to the original purpose of these valves. Why are they there in the first place? Depending on that answer, a decision will be much easier.

Thanks so much for your insights.

#H

[Propofoln]

Anyone have a guide or video how to do this? I want to do this on my CP M5. I don't need to jack it up do I?

[rocky]

no u dont have to jack up the car to wire open the valves. there are other posts that show you how to do it.....it is so easy, took less than five minutes per exhaust. all you need is medium size wire and some wire cutters. big diff in the tone at start up and louder during daily driving....and when u open it up you will unleash the beast..... see my video on earlier thread.

[JOHNBMWM5]

Originally Posted by (H)

Sounds like a great idea, I am considering doing it as well. But can somebody actually enlighten me as to the original purpose of these valves. Why are they there in the first place? Depending on that answer, a decision will be much easier.

Thanks so much for your insights.

#H

Purely noise only, the valves open at 3.5K Rpm anyway in sport or sport+, keeping them open makes the sound so much better and no drone.

[Dionysus]

Originally Posted by (H)

Sounds like a great idea, I am considering doing it as well. But can somebody actually enlighten me as to the original purpose of these valves. Why are they there in the first place? Depending on that answer, a decision will be much easier.

Thanks so much for your insights.

#H

H,

The exhaust flaps do control sound, but they also form part of the emission control system so wiring permanently open could impact function & longevity of catalytic converter. Wiring open may also impact efficiency in the warm up phase as I would expect the ECU to adjust settings to compensate.

Impact on warranty dependant on attitude of your dealership, how long car is to be kept (may not experience any ill effects in the short term), etc.

It would be interesting to get a view from a Master Technician, however, I'd imagine the response would be 'it's not recommended' rather than anything more insightful.

[JOHNBMWM5]

Originally Posted by Dionysus

H,

The exhaust flaps do control sound, but they also form part of the emission control system so wiring permanently open could impact function & longevity of catalytic converter. Wiring open may also impact efficiency in the warm up phase as I would expect the ECU to adjust settings to compensate.

Impact on warranty dependant on attitude of your dealership, how long car is to be kept (may not experience any ill effects in the short term), etc.

It would be interesting to get a view from a Master Technician, however, I'd imagine the response would be 'it's not recommended' rather than anything more insightful.

My M6 GC CP warms up quicker than my outgoing LCI M5 , both had the Valves wired open, the M5 for 12K miles , no problems at all, my ECU must have adapted on both cars by now.
M6 GC CP is more economical too.
PS) in my experience , master techs have less knowledge than we do.

[sdf10m5]

Did it.. prefect/slight tone increase that sounds great. Thanks for the recommendation O.-P. ! Will be doing the cyba tips next, to match the sound increase soon.
Considering I am not yet ready to bite the 8k$ bullet of getting the Akra exhaust, this is great to enhance the factory sound.

[JOHNBMWM5]

Originally Posted by sdf10m5

Did it.. prefect/slight tone increase that sounds great. Thanks for the recommendation O.-P. ! Will be doing the cyba tips next, to match the sound increase soon.
Considering I am not yet ready to bite the 8k$ bullet of getting the Akra exhaust, this is great to enhance the factory sound.

Here are my CYBA Tips with the Valves wired open.

[sdf10m5]

Wow, those look phenomenal !

[JOHNBMWM5]

Originally Posted by sdf10m5

Wow, those look phenomenal !

Yep 90mm black.

[Sejzilla]

Could anyone share a link for DIY instructions? I tried doing them but need some help.
Tried searching for it and couldnt find anything either.