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      06-27-2019, 08:48 AM   #221
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For those who have the exhaust mod done is this visible from underneath the car. The reason I ask is that I have the car under PCP and wonder how a dealer will feel about the mod especially when it comes to trade in?
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      06-27-2019, 09:28 AM   #222
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Quote:
Originally Posted by Driving for Charity UK View Post
For those who have the exhaust mod done is this visible from underneath the car. The reason I ask is that I have the car under PCP and wonder how a dealer will feel about the mod especially when it comes to trade in?
I haven't had the mod done...yet, however PCW takes exhaust off, and does work from top of boxes, so not visible from bottom

From his website:

I've modded lots of these with great results, a deeper, aggressive sound with clearer more defined crackles.

The process involves me removing the exhaust from the car and opening the two main silencers from above, inside each is a series of chambers and pipework, I use stainless parts and welding to internally straight through the airflow, once put back together and back on the car no evidence of my work can be seen.

this also leaves the flap functional so you still have a loud/quiet option, meaning no drone when cruising.

https://www.exhaustmods.co.uk/m140i-...0i-m440i-m640i
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      06-27-2019, 12:22 PM   #223
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They wouldn't physically notice the modification, but with a number of people having issues with the flaking exhausts i think it would become apparent at that stage or if any other issues were to arise in this area, if still in the warranty period could possibly give BMW a reason to void the warranty.

I also am very keen to get this done but later down the line due to reasons above, even though i intend to keep the car post PCP, as it has really grown on me
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      06-27-2019, 06:45 PM   #224
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Quote:
Originally Posted by verysideways View Post
Currently on my way back from a tour in Norway (it's my busy season at work!) but I'm very happy with the exhaust as it is now - effectively stock on the unvalved side and straight through on the valved side - with ASD disabled (through coding).
Barely louder than stock in comfort, but really fruity in sport/sport+
hey mate, you wouldn't happen to have a video of your setup would you?
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      06-28-2019, 12:12 PM   #225
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Here's what my little V8 sounds like.

The B58 is for sure the best sounding non-V8 out there.

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      12-24-2019, 12:06 AM   #226
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Got a question for you guys. I tried pulling fuse 203 today but realized the guys that installed my dashcam used it to piggyback for as well. Is there another fuse I can relocate the piggy back to so I can pull the 203 fuse? It's a 7.5 fuse, not sure if they changed it to a higher amp one because of dashcam or it's always a 7.5.

Any help would be appreciated
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      12-24-2019, 02:08 AM   #227
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Quote:
Originally Posted by X3M40i_Nev View Post
Quote:
Originally Posted by Driving for Charity UK View Post
For those who have the exhaust mod done is this visible from underneath the car. The reason I ask is that I have the car under PCP and wonder how a dealer will feel about the mod especially when it comes to trade in?
I haven't had the mod done...yet, however PCW takes exhaust off, and does work from top of boxes, so not visible from bottom

From his website:

I've modded lots of these with great results, a deeper, aggressive sound with clearer more defined crackles.

The process involves me removing the exhaust from the car and opening the two main silencers from above, inside each is a series of chambers and pipework, I use stainless parts and welding to internally straight through the airflow, once put back together and back on the car no evidence of my work can be seen.

this also leaves the flap functional so you still have a loud/quiet option, meaning no drone when cruising.

https://www.exhaustmods.co.uk/m140i-...0i-m440i-m640i

Mod done, love it!

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      01-02-2020, 02:36 AM   #228
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Quote:
Originally Posted by supersebbo View Post
A word of warning.

After doing the fuse-pull method to keep the flap open a couple of months ago, today we had some colder weather and I had reason to jump out the car while it was still running (forgot my wallet). As I walked round the car I noticed that vapor was only coming from the right pipe. I had a closer inspection and sure enough the flap was closed in the pipe.

I assume that as the flap is not being actively actuated it will/can eventually vibrate back into a closed position. As it will not be re-opened by the ECU this could cause potentially harmful back pressure on the engine at high loads.

To be safe I've re-installed the flap fuse.

I would advise flap-mod folks to periodically check the position of the flap so ensure it stays in the open position.
Has anyone else experienced this? Can it happen? I'd have thought if this were possible we would see reports of it by now.

Last edited by Zero71; 01-02-2020 at 02:59 AM..
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      01-02-2020, 04:53 AM   #229
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Quote:
Originally Posted by smanji View Post
They wouldn't physically notice the modification, but with a number of people having issues with the flaking exhausts i think it would become apparent at that stage or if any other issues were to arise in this area, if still in the warranty period could possibly give BMW a reason to void the warranty.

I also am very keen to get this done but later down the line due to reasons above, even though i intend to keep the car post PCP, as it has really grown on me
Yes, if I took mine in for flaking exhausts there is the likelihood that they wouldn't replace under warranty but this is something I knew and am aware of. Worst case scenario I either live with flaking (which I don't have anyway at the moment) or replace part of exhaust.

I certainly wouldn't go down the tune route for warranty purposes, but for me this was one I am fine with
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      01-02-2020, 04:54 AM   #230
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Quote:
Originally Posted by Zero71 View Post
Quote:
Originally Posted by supersebbo View Post
A word of warning.

After doing the fuse-pull method to keep the flap open a couple of months ago, today we had some colder weather and I had reason to jump out the car while it was still running (forgot my wallet). As I walked round the car I noticed that vapor was only coming from the right pipe. I had a closer inspection and sure enough the flap was closed in the pipe.

I assume that as the flap is not being actively actuated it will/can eventually vibrate back into a closed position. As it will not be re-opened by the ECU this could cause potentially harmful back pressure on the engine at high loads.

To be safe I've re-installed the flap fuse.

I would advise flap-mod folks to periodically check the position of the flap so ensure it stays in the open position.
Has anyone else experienced this? Can it happen? I'd have thought if this were possible we would see reports of it by now.
Am I missing something? By default on cold start only the right exhaust "fires"
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      01-02-2020, 05:37 AM   #231
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Quote:
Originally Posted by X3M40i_Nev View Post
Am I missing something? By default on cold start only the right exhaust "fires"
There’s some pressure from the near side pipe, but nowhere near as strong. When you rev the car from a cold start there’s much more vapour from the right side - almost nothing from the left.

I wondered if the exhaust flap was binary - completely open or completely closed, or if there was a different position for each driving mode.

It certainly sounds louder all the time as far as I can tell.

EDIT: managed to upload a short vid of a cold start with F203 pulled. Link only as I don’t know how to embed...

https://youtu.be/NAZdKw7_9kg

Last edited by Blacktemplar; 01-04-2020 at 06:49 AM..
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      01-02-2020, 08:54 PM   #232
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So I undid the f203 trick a couple days ago, now the exhaust won’t open under any mode.... has anyone else encounter this?

update: bought bimmerlink and force opened it.. but the sound does not sound as agressive as before now.. can the flap open partially?? I always thought the vavle can only open 100% and close 100%.

Last edited by davidchenliu; 01-03-2020 at 12:33 AM.. Reason: update
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      01-03-2020, 08:14 AM   #233
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Maybe I’m missing something obvious, but what am I looking for in the left exhaust? I don’t think I can see the valve, and the solenoid that controls it is round the second bend of the pipe.

If someone could post a pic of the valve (or at least the visible part of it) that would be much appreciated and help determine if I’m (a) losing it or (b) looking at the right thing
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      03-15-2020, 08:30 PM   #234
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So to try to summarise this long thread....

1. Hot climate versions (incl perhaps Australia) might already operate with both valves open all the time (or at least on startup)?

I can confirm that in Australian spec, even on Sport mode when I start up only one exhaust is producing noticeable pressure.

2. Pulling fuse 203 must be done (while engine is running), after 15 minutes of driving in Sport mode
3. May cause resonance at 2500 rpm?
4. May not be 100% reversible when you replace the fuse... some posts about the valve operation/exhaust sounds not being like they were before
5. Running an un-modded car in Sport+ mode achieves the same result as pulling fuse 203?
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Last edited by satz; 03-19-2020 at 04:53 PM..
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      03-15-2020, 08:35 PM   #235
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      03-16-2020, 02:33 AM   #236
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I notice on mine when I start it up it's loud, but if I just lightly tap the throttle even in the first few seconds, it quietens down dramatically, and doesn't go loud again. Is that normal?
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      03-19-2020, 06:05 AM   #237
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Quote:
Originally Posted by X3M40i_Nev View Post
Mod done, love it!

Thank you for all the information you wrote here!

I´ll try to do the same in a workshop in Barcelona specialized in exhaust mods once this covid19 nightmare goes to hell...with the objective of giving them proper instructions, could you please tell us if they have installed a direct pipe from 2 to just before the mechanical valve to the left exhaust exit inside the backbox?



I´m missing something fore sure, a direct pipe linking these two points will result in trapped gas in the whole circuit



@verysideways

Last edited by ArinXal; 03-19-2020 at 10:51 AM.. Reason: better explanation
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      04-08-2020, 03:49 AM   #238
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Quote:
Originally Posted by supersebbo View Post
A word of warning.

After doing the fuse-pull method to keep the flap open a couple of months ago, today we had some colder weather and I had reason to jump out the car while it was still running (forgot my wallet). As I walked round the car I noticed that vapor was only coming from the right pipe. I had a closer inspection and sure enough the flap was closed in the pipe.

I assume that as the flap is not being actively actuated it will/can eventually vibrate back into a closed position. As it will not be re-opened by the ECU this could cause potentially harmful back pressure on the engine at high loads.

To be safe I've re-installed the flap fuse.

I would advise flap-mod folks to periodically check the position of the flap so ensure it stays in the open position.

Has anyone else experienced this recently?
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      04-08-2020, 06:50 AM   #239
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Quote:
Originally Posted by JabzSA View Post
After reading many of the posts here...i took out both fuses on my 2 day old car.

On start-up, the exhaust (now open on the left also) is louder. After a while, it quietens down. So everything works as expected.

The problem with the ASD fuse - it affected my audio in the car and no sound came, so put it back.

The big question: how do i get the exhaust burble back????

Did you lose the exhaust burble because you removed fuse 203?

Have you worked out how to restore the burbles?
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      04-09-2020, 01:27 AM   #240
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So I finally checked out how my exhaust/valves seem to operate (unmodified).

On startup I get the loud sound for about a minute, but only the RHS exhaust is putting out any pressure. Nothing from left.

This is regardless of whether I start in Comfort or Sport mode.

Then when I switch to Sport or Sport Plus (or even Sport Indiv I think)... I can hear a mechanical noise for a moment. Then I can feel some pressure from the left exhaust, plus hear the exhaust tone from the left pipe.

I did find that sometimes I needed to prod the accelerator and then let it idle.

When I switch back to Comfort, the left exhaust stops producing any pressure or noise.

Mine's a 6/18 build without particle filter (and also doesn't have the vanes behind front grilles)
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      04-09-2020, 01:47 AM   #241
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Quote:
Originally Posted by satz View Post
Quote:
Originally Posted by JabzSA View Post
After reading many of the posts here...i took out both fuses on my 2 day old car.

On start-up, the exhaust (now open on the left also) is louder. After a while, it quietens down. So everything works as expected.

The problem with the ASD fuse - it affected my audio in the car and no sound came, so put it back.

The big question: how do i get the exhaust burble back????

Did you lose the exhaust burble because you removed fuse 203?

Have you worked out how to restore the burbles?
I have an 2018 m40i and I've lost my burbles as well. I haven't pulled out that fuse tho. I thought they might come back with a stage 1 tune but so far no luck. I get them every once in a while downshifting to like 5k but only very briefly and their extremely quiet.
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      05-24-2020, 10:59 AM   #242
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Quote:
Originally Posted by X3M40i_Nev View Post
Mod done, love it!

Really love it and I will do the same mod too
Just wondering if you had both sides opened up or just Valved side: full mod, Unvalved side: stock

And important question, I do a lot of highway cruising, 70-80-90 mph
Does it drone ?

Thanks
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