Want to keep your exhaust flaps open all the time, without unplugging them? READ UP!

[gabemcclintock]

I chose using the plugs in case that fuse was needed for anything not listed.

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Difficult to install? Can't find any install notes for a 2018 RS5 coupe.

[HyperM3]

Difficult to install? Can't find any install notes for a 2018 RS5 coupe.

I have an S5 but I did it on a previous S6 also. All the plugs are basically the same. Toughest part is getting your fingers up and over the exhaust to get to the clips.

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[coolwater]

Difficult to install? Can't find any install notes for a 2018 RS5 coupe.

Here it is on my SQ5. A little easier to get to with the air suspension. Plus You would need one on each side for S5/RS5.

https://youtu.be/eB1Qb86FT-A

-cW


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[dal59]

Fortunately, I have no problem, dislike or concern with my valves opening and closing. However, I am wondering if anyone knows for absolute certain why Audi set it up this way? It certainly would have been very easy for them to program the valves to stay open in Dynamic mode. I keep wondering if there is a legitimate mechanical reason to have them open and close. Meaning, as mentioned in other posts, to maintain proper back pressure and power when needed or some other reason we are unaware of.

[scott1961]

It's to make car more quite, B9 does not open and close like 9.5 does. Drove me bonkers

[thadoggfatha]

The topic in terms of the valves having an impact on back pressure seems odd to me. I only say this because the most restrictive point on the exhaust would by the primary cats. When removing the primary cat or going to a sport cat there would definitely be lower back pressure. This would have larger effect than the valve would have all the way at the back in the muffler. By that logic I don’t really see the valves being open have any effect on the power the car can deliver from a purely theoretical point. The only way to determine an answer to this is to put the car on a dyno.

I also have my reservations about making less power due to the code of the valves being disconnected through the fuse. The reason I say this is if Audi wanted to reduce power by way of a code due to loss in back pressure I would assume the sensor by the primary cat would restrict the power the car is able to make when the back pressure is reduced/ eliminated.

Now from what’s reported it seems people are not able to feel a decrease in power and correct me if I am wrong but there have already been test completed stating the valves have no impact on power loss. It would make sense if that was the case. Let’s also not forget that the AWE exhaust suit being offered removed the valves from the exhaust entirely.

Feel free to critique this because maybe we can get to the bottom of this.

[scott1961]

Agree with above. All cars I have owned seem to have it that when in sport or race mode valves are always open. Also on my 488 that was TT first mod I did was to keep valves open at all times, most do that and have seen dyno's that show no change after. I really think it's all part of quieting cars down just like how you can't rev past 4K now. On my current Evo I can but wont be able to on my new one coming

[ToroTheShibe]

The topic in terms of the valves having an impact on back pressure seems odd to me. I only say this because the most restrictive point on the exhaust would by the primary cats. When removing the primary cat or going to a sport cat there would definitely be lower back pressure. This would have larger effect than the valve would have all the way at the back in the muffler. By that logic I don’t really see the valves being open have any effect on the power the car can deliver from a purely theoretical point. The only way to determine an answer to this is to put the car on a dyno.

I also have my reservations about making less power due to the code of the valves being disconnected through the fuse. The reason I say this is if Audi wanted to reduce power by way of a code due to loss in back pressure I would assume the sensor by the primary cat would restrict the power the car is able to make when the back pressure is reduced/ eliminated.

Now from what’s reported it seems people are not able to feel a decrease in power and correct me if I am wrong but there have already been test completed stating the valves have no impact on power loss. It would make sense if that was the case. Let’s also not forget that the AWE exhaust suit being offered removed the valves from the exhaust entirely.

Feel free to critique this because maybe we can get to the bottom of this.

When I first removed the fuse on stock sport exhaust, I did notice a decrease in burbles but in exchange for louder pops. Since then, I have got the AWE non resonated. I believe AWE actually argues that without the flaps working, you lose power and that’s why they included a dummy valve to trick the system that the valves are still working. I decided to pull the fuse anyway since I can’t stand the clicking sound the simulator makes.

Never noticed any loss/gain in power.

[Yeoman]

When I first removed the fuse on stock sport exhaust, I did notice a decrease in burbles but in exchange for louder pops. Since then, I have got the AWE non resonated. I believe AWE actually argues that without the flaps working, you lose power and that’s why they included a dummy valve to trick the system that the valves are still working. I decided to pull the fuse anyway since I can’t stand the clicking sound the simulator makes.

Never noticed any loss/gain in power.

APR says the same - apparently measured a 20hp loss but nullified it with their tune. I personally didn't feel any difference, either.

[solarrs5]

good news guys, going in for a dyno session with my APR tuned RS5 SB ill try a run both ways and report the results back later this week.

[scott1961]

good news guys, going in for a dyno session with my APR tuned RS5 SB ill try a run both ways and report the results back later this week.

That could show that APR has tuned out the loss of power but what we really need is a stock car to do with and without fuse out

[dal59]

Agreed. The car would have to be stock and put on dyno. Although, we all love this crap, so I am sure the results would still be welcome anyway. Naturally, I have no idea if pulling the fuse loses power or not. However, a loss or gain of 10HP or even 20HP is very difficult to "feel". I would seriously question anyone that claims to have a "butt dyno" that sensitive.

[solarrs5]

Hey guys i just got back from the dyno, ad i can report there was no change between open and close !!!
we ran 2 runs each maybe 5 hp variances.

the car put down 525hp and 600ft torque on a mustang dyno.
the car is a 2019 audi RS5 SB with a stage 1 Tune, AWE intake, Carbon Labs downpipes.

we were also on pump gas.

i will upload the pics here soon.

[scott1961]

Great numbers for a Mustang. I take it those are at crank numbers?

[solarrs5]

Great numbers for a Mustang. I take it those are at crank numbers?

correct,
it was 508 torque and 456 hp at the wheels factor in around 18% for drivetrain loss.

[Shock&Awe]

Hi all, I’m new here and I would like to thank the OP for discovering the 7.5 amp fuse. I was about to remove the exhaust flap plugs and blank them off because they were driving me crazy with their opening and closing. The OP has saved me a tonne of work.
The car sounds glorious now with the flaps always opened. Those who are worried that the 7.5 amp fuse will make the car lose power or keeping the flaps opened all the time will make the car lose power are obviously too paranoid and don’t understand how cars are made 😜

[Innovator]

As the OP, I've had the fuse out pretty much since I owned the car. But I don't actually have the fuse out, rather, I put a switch in line with the fuse, so I can turn it on and off.
Sometimes the stock exhaust will drone especially when you're in a high gear if the flaps are left open.. If I'm on a long trip I will turn the switch on and allow the flaps to function normally. The actuator that moves the flaps makes a tremendous amount of noise when you come to a stop. It probably does it all the time but you don't hear it with the motion and noise at the car makes. But, the only downside is some occasional drone. Otherwise the car sounds terrific with the flaps open and there's no way that you losing power. That's crap.

[Gilquattro]

Would this work on a 2021 S4?

[HyperM3]

Would this work on a 2021 S4?

Yes

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[JGreen76]

Without reading all of what's in these five pages. I ordered last night some plug-ins from Burger Motorsports that keep the vales open w/o a CEL. Updates to follow... and my Bull-X are due to deliver today.

[scott1961]

Without reading all of what's in these five pages. I ordered last night some plug-ins from Burger Motorsports that keep the vales open w/o a CEL. Updates to follow... and my Bull-X are due to deliver today.

Seems pulling fuse does not give you a CEL, but you do get a soft code. So you will need to scan to see if you get that. I have a valve controller and no soft code with that if you set correctly

[JGreen76]

I'm not a fan of removing fuses. I'll check for the soft code after install. Thanks

[luuat]

I'm not a fan of removing fuses. I'll check for the soft code after install. Thanks

Do you have the flaps open at all times and the Bull-X? How does it sound?

[yoffer]

Cant you disable the exhaust flaps using vcds using the long coding?

[scott1961]

Cant you disable the exhaust flaps using vcds using the long coding?

No

[yoffer]

No

Hmmmm, ok.

[Kerbouchard]

Does anyone know if the exhaust button on the R8 steering wheel kit can be made to control the flaps directly? Yaode says yes on his website/YouTube, but not a ton of details.

Installed burger plug in modules (which didn’t come with caps to cover the now empty sockets on the valves themselves). So far so good. Exhaust sounds great, haven’t scanned for codes yet.

[itr0045]

Pulled the fuse, and am liking the results. Good post.

[Rodomontade]

This..

https://youtube.com/shorts/xhtvXFNqZHg?feature=share

[Innovator]

Private video

[Rodomontade]

Private video

Sorry bout that..
Fixed

[scott1961]

Sorry bout that..
Fixed

What exactly are we looking at? Is that something in our cars or something you add?

[Rodomontade]

What exactly are we looking at? Is that something in our cars or something you add?

I wanted the car to start with the exhaust flaps open but still wanted to be able to select the modes. As you know the car always starts with the valves closed muting the cold start-up.
I put a count down timer in to keep the valves open for 3.5 minutes and then revert to the OEM configuration once this timer reaches 0. I can tap the dash button or put it in sport mode if I want the valves to operate as normal. Timer can be set to any amount of countdown time. I was using the other options but I didn't like the fact the valves would be disabled all the time. This gives me the best of both worlds for my application. I can explain how I did this if anyone is interested.

[scott1961]

In 2021 valves keep opening and closing no matter what mode you are in, that is why I put on a Milltek valve controller. Almost always drive with them open and they are then open at cold start. But with a push of a button on my phone I can change to stock mode

[Bezlar]

Delete plugs work great. Even open valved it’s not that loud.


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[dal59]

So, when installing the delete plugs, do you have to make sure the valves are open before installing like you do when pulling the fuse?

[Burrcold]

How loud are cold starts once you install the delete plugs? I read a few people that installed them on the S4 and said it was too loud and your neighbors will hate you lol

[scott1961]

I have a RS5 with Miltek and valves are always open and it's not that loud. Neighbors may hate me for Huracan though

[dal59]

Although I am unlikely to use them, I just bought a set of the exhaust valve delete plugs just to have a set handy. Everything I read for the RS5 said to make sure to get the 4-pin configuration. However, when I received them today, the plug that goes into the wiring harness has only 2 pins flanked by 2 female receivers. Since I have not been under the car yet to check, I am assuming that the harness plug also has just 2 pins with 2 female receivers in the center, and when these 2 plugs come together there will be 4 pins?

[DarkPhantom]

Do you have the flaps open at all times and the Bull-X? How does it sound?

I have the Bull-X and just removed the fuse to keep the flaps open. The sound became loud in all revs, much more sporty, no more random open/close. Some big rumble with low revs, so no more quiet at all.
The cracks and pops still there at the downshifts but for some reason no more pops when upshifting.


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