X3 M40i Exhaust Mod

verysideways · 05-22-2019, 03:02 AM

Quote:

Originally Posted by smanji

you back yet?!

Yup - drove the car yesterday, it sounds great in comfort but it's a little bit much in sport, and that 2.5k/3k resonance is LOUD.
Off to my local place today to undo a small part of the mod and hopefully that will put me back where i want to be, close to stock with the valve closed and "fruity" with the valve open.

Will report back later today or tomorrow.

verysideways · 05-22-2019, 08:55 AM

Reverted to stock on the non-valved side, so when the valve is closed (in comfort) the exhaust sounds more or less stock. Subdued when pressing on, but whisper quiet on cruise control at motorway speeds.

The valved side is effectively straight through though, so when in sport or sport+ the whole thing sounds so much better. Crackles, pops, and a proper straight six noise when you're "on it".

TL;DR
Almost as quiet as stock in Comfort/Eco
Fruity but not annoying in Sport/Sport+

london_v · 05-22-2019, 09:54 AM

Quote:

Originally Posted by verysideways

Reverted to stock on the non-valved side, so when the valve is closed (in comfort) the exhaust sounds more or less stock. Subdued when pressing on, but whisper quiet on cruise control at motorway speeds.

The valved side is effectively straight through though, so when in sport or sport+ the whole thing sounds so much better. Crackles, pops, and a proper straight six noise when you're "on it".

TL;DR
Almost as quiet as stock in Comfort/Eco
Fruity but not annoying in Sport/Sport+

Sounds like you've got the mod spot on! Thanks for sharing and I'll let you know how I get on

Driving for Charity UK · 05-22-2019, 12:04 PM

Quote:

Originally Posted by verysideways

Reverted to stock on the non-valved side, so when the valve is closed (in comfort) the exhaust sounds more or less stock. Subdued when pressing on, but whisper quiet on cruise control at motorway speeds.

The valved side is effectively straight through though, so when in sport or sport+ the whole thing sounds so much better. Crackles, pops, and a proper straight six noise when you're "on it".

TL;DR
Almost as quiet as stock in Comfort/Eco
Fruity but not annoying in Sport/Sport+

Thats great thanks

Can you summarise the best way to do this MOD with PCW?

A video of your exhaust would also be very useful.

Cheers.

london_v · 05-22-2019, 12:14 PM

Quote:

Originally Posted by Driving for Charity UK

Quote:

Originally Posted by verysideways

Reverted to stock on the non-valved side, so when the valve is closed (in comfort) the exhaust sounds more or less stock. Subdued when pressing on, but whisper quiet on cruise control at motorway speeds.

The valved side is effectively straight through though, so when in sport or sport+ the whole thing sounds so much better. Crackles, pops, and a proper straight six noise when you're "on it".

TL;DR
Almost as quiet as stock in Comfort/Eco
Fruity but not annoying in Sport/Sport+

Thats great thanks

Can you summarise the best way to do this MOD with PCW?

A video of your exhaust would also be very useful.

Cheers.

Hi mate it's already been summarised. Backbox mod on valved exhaust only to make internal pipes straight. No modification to non-valved exhaust.

Video is on PCW's insta and Facebook pages.

Driving for Charity UK · 05-22-2019, 12:24 PM

Quote:

Originally Posted by london_v

Hi mate it's already been summarised. Backbox mod on valved exhaust only to make internal pipes straight. No modification to non-valved exhaust.

Video is on PCW's insta and Facebook pages.

Thanks was the video before or after you reverted to stock on the valves side and is your car a 2018 model or the 2019 model with the PPF?

Or does is not matter at static I.e not under load?

london_v · 05-22-2019, 12:27 PM

Quote:

Originally Posted by Driving for Charity UK

Quote:

Originally Posted by london_v

Hi mate it's already been summarised. Backbox mod on valved exhaust only to make internal pipes straight. No modification to non-valved exhaust.

Video is on PCW's insta and Facebook pages.

Thanks was the video before or after you reverted to stock on the valves side and is your car a 2018 model or the 2019 model with the PPF?

Or does is not matter at static I.e not under load?

Hi there the car in question is a PPF model and the video was taken when both exhausts were modified

Driving for Charity UK · 05-22-2019, 12:30 PM

Quote:

Originally Posted by london_v

Hi there the car in question is a PPF model and the video was taken when both exhausts were modified

But you feel it sounds better with only one side done?

london_v · 05-22-2019, 12:31 PM

Quote:

Originally Posted by Driving for Charity UK

Quote:

Originally Posted by london_v

Hi there the car in question is a PPF model and the video was taken when both exhausts were modified

But you feel it sounds better with only one side done?

I haven't got it done yet! But from what VS says, yes it does

verysideways · 05-23-2019, 12:37 AM

Static isn't representative of driving - no load.
The PCW video is what it sounded like in sport with both sides modified, but it still sounds like that in sport with just one side done.
In comfort now it's barely louder than stock, but that's what I wanted.

I'll try and get a quick video later this morning... if I can capture the effect properly!

If you're anywhere near Gloucestershire you're welcome to come over and hear it first hand 😁

smanji · 05-24-2019, 11:48 AM

glad to hear there is some crackle and pop back!

r0ddy · 06-03-2019, 04:49 AM

Has anyone with a PPF model actually done the fuse pull to keep the valve open? Does it make a difference at all (not during cold start),wouldnt mind a bit more sound on the overrun, as from what i've read sure the valve closes on a closed/partial throttle.

london_v · 06-03-2019, 04:40 PM

Quote:

Originally Posted by r0ddy

Has anyone with a PPF model actually done the fuse pull to keep the valve open? Does it make a difference at all (not during cold start),wouldnt mind a bit more sound on the overrun, as from what i've read sure the valve closes on a closed/partial throttle.

Yes I did and then undid it. It only makes a difference on cold start. Otherwise driving around having pulled the fuse is the same as sport / sport plus.

JabzSA · 06-07-2019, 01:46 AM

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????

r0ddy · 06-07-2019, 04:02 AM

Think the only way is to get a modification done to the exhaust, I'm looking at having mine done but will wait till at least after its first service.

LimiX4m40 · 06-07-2019, 06:05 AM

Quote:

Originally Posted by JabzSA

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????

The burbles you can get back with a „software" in german its called: schubabschaltung in englisch i dont know

london_v · 06-08-2019, 06:46 AM

Quote:

Originally Posted by verysideways

Static isn't representative of driving - no load.
The PCW video is what it sounded like in sport with both sides modified, but it still sounds like that in sport with just one side done.
In comfort now it's barely louder than stock, but that's what I wanted.

I'll try and get a quick video later this morning... if I can capture the effect properly!

If you're anywhere near Gloucestershire you're welcome to come over and hear it first hand 😁

How are you getting on with the exhaust bud? Any further thoughts / feelings post install?

verysideways · 06-08-2019, 02:54 PM

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+

london_v · 06-25-2019, 12:39 PM

Quote:

Originally Posted by verysideways

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+

Done mine earlier. Initially I had straight through on non-valved side and part done on valved side. The resonance was indeed a bit too loud!

Then went to your set up with straight through on valved side and stock on non-valved. Sounds a lot better!

X3M40i_Nev · 06-25-2019, 03:08 PM

What is PCW charging for this? Around £300?

_ink · 06-25-2019, 05:55 PM

Anyone have a picture of the back box opened for surgery?

The ideal setup based on sideways comments (thanks for pioneering it all) is:

- Stock backbox
- Removal of resonator

Am I correct here?

london_v · 06-26-2019, 02:01 AM

Quote:

Originally Posted by _ink

Anyone have a picture of the back box opened for surgery?

The ideal setup based on sideways comments (thanks for pioneering it all) is:

- Stock backbox
- Removal of resonator

Am I correct here?

Hi bud, no. The change is only to the back box:

Valved side: full mod
Unvalved side: stock

And yes price is £300. Paul has done 3 in total. 2 are with the setup above and 1 with both sides modded (that would be too loud for me as it generated a lot of resonance in the cabin that wasn't exhaust note, just noise)

05-22-2019, 08:55 AM	#200
verysideways Lateral grip estimator 967 Rep 1,390 Posts Drives: i4, M2 Join Date: Jul 2011 Location: Cotswolds, UK iTrader: (0) Garage List 2023 BMW i4 Individual [8.37] 2010 Porsche 997.2 ... [10.00] 2002 Morgan Aero 8 [10.00]	Reverted to stock on the non-valved side, so when the valve is closed (in comfort) the exhaust sounds more or less stock. Subdued when pressing on, but whisper quiet on cruise control at motorway speeds. The valved side is effectively straight through though, so when in sport or sport+ the whole thing sounds so much better. Crackles, pops, and a proper straight six noise when you're "on it". TL;DR Almost as quiet as stock in Comfort/Eco Fruity but not annoying in Sport/Sport+ __________________ '20 BMW M2 '23 BWM i4 Mora '10 Porsche 997 '02 Morgan Aero 8 http://petrolhead.tours
	Appreciate 2 london_v157.50 _ink627.50 Quote

05-23-2019, 12:37 AM	#208
verysideways Lateral grip estimator 967 Rep 1,390 Posts Drives: i4, M2 Join Date: Jul 2011 Location: Cotswolds, UK iTrader: (0) Garage List 2023 BMW i4 Individual [8.37] 2010 Porsche 997.2 ... [10.00] 2002 Morgan Aero 8 [10.00]	Static isn't representative of driving - no load. The PCW video is what it sounded like in sport with both sides modified, but it still sounds like that in sport with just one side done. In comfort now it's barely louder than stock, but that's what I wanted. I'll try and get a quick video later this morning... if I can capture the effect properly! If you're anywhere near Gloucestershire you're welcome to come over and hear it first hand 😁 __________________ '20 BMW M2 '23 BWM i4 Mora '10 Porsche 997 '02 Morgan Aero 8 http://petrolhead.tours
	Appreciate 0 Quote

05-24-2019, 11:48 AM	#209
smanji Private First Class 133 Rep 186 Posts Drives: X3 M40i Alpine White Join Date: Oct 2018 Location: UK iTrader: (0) Garage List 2004 Honda Civic Ty ... [0.00]	glad to hear there is some crackle and pop back!
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06-03-2019, 04:49 AM	#210
r0ddy New Member 0 Rep 5 Posts Drives: X3 M40i Join Date: Jun 2019 Location: London iTrader: (0)	Has anyone with a PPF model actually done the fuse pull to keep the valve open? Does it make a difference at all (not during cold start),wouldnt mind a bit more sound on the overrun, as from what i've read sure the valve closes on a closed/partial throttle.
	Appreciate 0 Quote

06-07-2019, 01:46 AM	#212
JabzSA Private First Class 76 Rep 138 Posts Drives: '13 MW 6MT Join Date: Feb 2014 Location: Richmond iTrader: (0)	Exhaust tweaks 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???? __________________ '13 M3, Mineral White, 6MT (back to my addiction) '15 991.1 GT3 (sold) '77 911s, Targa Red, Coupe (sold under duress) '13 M3, Melbourne Red, ZCP(sold) '08 M3, Space Grey (sold)
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06-07-2019, 04:02 AM	#213
r0ddy New Member 0 Rep 5 Posts Drives: X3 M40i Join Date: Jun 2019 Location: London iTrader: (0)	Think the only way is to get a modification done to the exhaust, I'm looking at having mine done but will wait till at least after its first service.
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06-08-2019, 02:54 PM	#216
verysideways Lateral grip estimator 967 Rep 1,390 Posts Drives: i4, M2 Join Date: Jul 2011 Location: Cotswolds, UK iTrader: (0) Garage List 2023 BMW i4 Individual [8.37] 2010 Porsche 997.2 ... [10.00] 2002 Morgan Aero 8 [10.00]	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+ __________________ '20 BMW M2 '23 BWM i4 Mora '10 Porsche 997 '02 Morgan Aero 8 http://petrolhead.tours
	Appreciate 2 london_v157.50 ArinXal55.50 Quote

06-25-2019, 03:08 PM	#218
X3M40i_Nev Straight Six Convert 449 Rep 894 Posts Drives: 2019 X3 M40i Join Date: May 2019 Location: Cotswolds, UK iTrader: (0) Garage List 2018 Mini JCW [10.00] 2019 BMW X3 M40i [10.00]	What is PCW charging for this? Around £300?
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06-25-2019, 05:55 PM	#219
_ink Jedi samurai ninja turtle 628 Rep 3,021 Posts Drives: X3 M40i 2018 Join Date: May 2012 Location: Sydney, Australia iTrader: (0) Garage List 2018 X3 M40i [0.00]	Anyone have a picture of the back box opened for surgery? The ideal setup based on sideways comments (thanks for pioneering it all) is: - Stock backbox - Removal of resonator Am I correct here?
	Appreciate 0 Quote