[UltraDave]

You don’t have to worry about playing with fuses or unconnecting wires. Just get the BimmerLink app and an obdII connector. Push a button and you’re done!

[TopperX5]

Will this work on the 40i X-line package or do you need to have the M sport package?

[bioman]

Originally Posted by Galion

Pulled the fuse at WOT Sport+ M2. How do I know the flap is open? Not a noticeable difference in sound, and can´t see the flap since the exhaust is curved. Anyone knows?

After cold start is done, you should feel the exhaust gases coming out of both tips instead of just one.

[jad03060]

FWIW, in the US, making changes to the emission controls can get you into trouble. The flap is there to help the vehicle warm up quicker by getting the catalytic converter up to temperature faster. In the meantime, you're going to be spewing more emissions than you should. All this for a little cold start improvement in sound?

[AmooManiak]

Originally Posted by jad03060

FWIW, in the US, making changes to the emission controls can get you into trouble. The flap is there to help the vehicle warm up quicker by getting the catalytic converter up to temperature faster. In the meantime, you're going to be spewing more emissions than you should. All this for a little cold start improvement in sound?

What kind of trouble? I've seen people drive around with catless downpipes and pass emission tests - which is basically the standard in Illinois as far as emissions goes. I've never seen anyone get into "trouble" for messing with an exhaust - unless maybe Cali?

[Galion]

Anybody else feels more turbo lag / less low end torque with this mod? I think it’s quite noticeable in comfort or Sport mode.

[-Vanguard-]

Originally Posted by Galion

Anybody else feels more turbo lag / less low end torque with this mod? I think it’s quite noticeable in comfort or Sport mode.

Probably because there's less back pressure for the turbo.

I don't see a point in welding a flap or pulling a fuse on a 70k+ luxury vehicle to make it sound 10% better at all time.

Keep it in sport and the flap opens, whats the big deal? Do you really need it to be a little bit louder on start up? Will it hurt your ego if people can't hear your 6 cyl exhaust at low rpms? This engine sounds fantastic in sport mode. It's not electronic sound piped in either, its the real deal. I had my GF do a pull while I was outside and it sounded awesome in sport.

Pony up 3K for the M performance exhaust if you want a nicer sound.

This isn't a damn college kid civic to play around with fuses and welds.

[jad03060]

The vehicle passed its emission test procedure as delivered. Making changes to that, if done by a shop, is a severe fine. It's a little messier if the owner does it. By taking longer to warm up, the vehicle will also use more fuel. Catalytic converters require some excess fuel to bring them up to temp to work properly. By opening up the flap early, it will be using more fuel for longer to achieve that. All this for a bit of sound? Personally, I like it quiet. Now, if I floor it, that's another thing, but just sitting there, quiet is better.

[AmooManiak]

Again, fine by who? I've passed multiple emissions tests in Illinois without catalytic convertors. Only a number of systems have to be in a "ready" state to pass emissions. Please don't spread misinformation, or at least limit it to your state.

[jad03060]

FWIW, at least in NH, while they used to do a tailpipe emissions test, now, they look only at the computer to see if there are any faults.

If a mechanic disables any emission control equipment in a vehicle, it's a federal hit...now, how they would get involved would likely depend on what the state alerted them to, which, in many places just doesn't happen.
https://www.epa.gov/enforcement/clea...se-resolutions

If your state runs actual exhaust pipe testing, by the time you drove there, the vehicle was likely at full operating temperature, and it would not show a hit. But, each time you do a cold start, you'd be putting more pollutants into the air, all to just sound better to you.

[AmooManiak]

No, they've been doing it via OBD2 for a long time in Illinois. You are allowed to have a few system in "not ready" state, which is what I was referring to.

Originally Posted by jad03060

FWIW, at least in NH, while they used to do a tailpipe emissions test, now, they look only at the computer to see if there are any faults.

If a mechanic disables any emission control equipment in a vehicle, it's a federal hit...now, how they would get involved would likely depend on what the state alerted them to, which, in many places just doesn't happen.
https://www.epa.gov/enforcement/clea...se-resolutions

If your state runs actual exhaust pipe testing, by the time you drove there, the vehicle was likely at full operating temperature, and it would not show a hit. But, each time you do a cold start, you'd be putting more pollutants into the air, all to just sound better to you.

[Jrunr]

Originally Posted by -Vanguard-

.

Pony up 3K for the M performance exhaust if you want a nicer sound.

.

Did this exhaust come with the M Sport package? Or is it something different?

[-Vanguard-]

Originally Posted by Jrunr

Did this exhaust come with the M Sport package? Or is it something different?

No, thats M sport. M performance is different and sounds really nice.

[Jrunr]

Originally Posted by -Vanguard-

No, thats M sport. M performance is different and sounds really nice.

What is the difference? Just a little less sound dampening? Bigger diameter piping? Less restrictive? Or is it just an audible difference?

[redbullfan]

I feel like this mod is useless on MY21. The MY21 cars sound quieter compared to the older ones.

[MrAH]

I realized the valve is open by default when car is off. I wrote a more detailed elaboration of my discovery here: https://g05.bimmerpost.com/forums/sh....php?t=1789350

[Don Juan]

I had the wire method and had it open for almost a year. sound was great, specially when the car first starts. did not hear any drone..but i felt the low-end torque being affected. I do have the racechip installed and even like that my low end suffered. I reverted back to stock and the low end torque came back! car feels quick again from the start... also using the sport individual with comfort settings as someone else mentioned and the car has a bit more sound than comfort. Not as loud as the flap open but ok..so keeping my flap back to stock..my 2 cents