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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications Cheapest way to make M340i louder?

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      06-26-2020, 12:27 AM   #1
HyeM340i
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Cheapest way to make M340i louder?

I've been looking into catted vrsf DP's but they're kind of expensive and I don't want to muffler delete due to drone. Any ideas?
I've looked at catless but I dont want CEL and gasoline smell.
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      06-26-2020, 08:15 AM   #2
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Sawzall rental.





Or just unplugging the valve in the open position.
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      06-26-2020, 08:17 AM   #3
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Quote:
Originally Posted by jstnstr View Post
Sawzall rental.





Or just unplugging the valve in the open position.
+1 on unplugging the valve while it's open. FREE
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      06-26-2020, 11:56 AM   #4
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Quote:
Originally Posted by M340_pilot View Post
+1 on unplugging the valve while it's open. FREE
I thought the valve stays open during sport+?

Last edited by HyeM340i; 06-26-2020 at 12:20 PM..
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      06-26-2020, 01:58 PM   #5
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Golf tee mod?
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      06-27-2020, 06:33 PM   #6
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resonator delete if the g20 m340 has one
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      06-27-2020, 08:29 PM   #7
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Quote:
Originally Posted by Soul_Glo View Post
Golf tee mod?
ha you're dating yourself by saying "golf tee mod" and i'm dating myself because i know what you're talking about lol

that said in the 3 series we lost the golf tee mod in 2012 with the introduction of the f series which replaced the pneumatic / vacuum actuated exhaust valve with an electric one - as others have mentioned now you just pull the plug (the same general design carried over to the g series)

thanks for sharing - i miss the golf tee days!!
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      06-27-2020, 08:43 PM   #8
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Quote:
Originally Posted by Phillipberk View Post
resonator delete if the g20 m340 has one
unlike the f series 340 - the m340 is dual piped from the dp to the muffler with no resonators. This really surprised me (pleasantly) the first time i looked under the car :-)
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      06-27-2020, 10:43 PM   #9
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Quote:
Originally Posted by HyeM340i View Post
I thought the valve stays open during sport+?
Supposedly it closes sometimes at low RPM? I never believed it did but some people claim it does. It's certainly closed on cold start even in Sport +, but if you unplug it while it's open it will just always be open.

I did this mod but will probably undo it, not really a huge benefit and I like being able to shut it in other modes.
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      06-29-2020, 09:39 AM   #10
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cheapest would be straight pipe but it does not sound good in my opinion. Your best bet is still the catted VRSF
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      06-29-2020, 05:24 PM   #11
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A decent cold air intake system can add some nice sound too. It's not only the exhaust to consider 👍
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      06-29-2020, 09:08 PM   #12
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Quote:
Originally Posted by Don76 View Post
A decent cold air intake system can add some nice sound too. It's not only the exhaust to consider 👍
Was thinking of adding the BMS intake myself but don't see a whole lotta love for it around these parts it seems?
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      06-29-2020, 09:17 PM   #13
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Quote:
Originally Posted by Gdiddy23 View Post
Was thinking of adding the BMS intake myself but don't see a whole lotta love for it around these parts it seems?
It's a fine part I have purchased one in the past for a previous car. That said if you are a believer that the warmer air it will pull in is not a good idea then it is not a fit for you. You will indeed get more intake noise which is really why you should do this mod. Any additional HP claims +/- are within the dyno's margin of error.

Like an exhaust on the M340 - do it for the sound not the performance

Just my 2-cents
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      06-29-2020, 09:48 PM   #14
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Quote:
Originally Posted by chenry View Post
Quote:
Originally Posted by Gdiddy23 View Post
Was thinking of adding the BMS intake myself but don't see a whole lotta love for it around these parts it seems?
It's a fine part I have purchased one in the past for a previous car. That said if you are a believer that the warmer air it will pull in is not a good idea then it is not a fit for you. You will indeed get more intake noise which is really why you should do this mod. Any additional HP claims +/- are within the dyno's margin of error.

Like an exhaust on the M340 - do it for the sound not the performance

Just my 2-cents
Appreciate the insight! And yeah it would be mostly for the noise but I also wonder about it pulling in extra warm air and if it would actually negate any benefits on a hot summer day
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      06-29-2020, 11:05 PM   #15
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Quote:
Originally Posted by jstnstr View Post
Sawzall rental.





Or just unplugging the valve in the open position.
Stole my answer
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      07-06-2020, 09:02 PM   #16
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Quote:
Originally Posted by imported_Mike View Post
Quote:
Originally Posted by HyeM340i View Post
I thought the valve stays open during sport+?
Supposedly it closes sometimes at low RPM? I never believed it did but some people claim it does. It's certainly closed on cold start even in Sport +, but if you unplug it while it's open it will just always be open.

I did this mod but will probably undo it, not really a huge benefit and I like being able to shut it in other modes.
If it's like my M3, it still closes at higher gears when cruising. I had an OBD device and phone app that allows you to keep the valves open at all times (even in Efficient) and you can notice the louder sound as you switch it on the highway.
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      07-13-2020, 04:11 AM   #17
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Is unplugging the valve in the open position causing any sort of error messages in the car? Do you foresee any unexpected issues by doing so?

Just curious whether it's something safe to do over a longer period of time and in different weather conditions
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      07-13-2020, 10:33 AM   #18
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Quote:
Originally Posted by mkbrv View Post
Is unplugging the valve in the open position causing any sort of error messages in the car? Do you foresee any unexpected issues by doing so?

Just curious whether it's something safe to do over a longer period of time and in different weather conditions
Unplugging it won't throw any errors and you can wrap the plug and socket with electrical tape to keep it safe from the elements.
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      07-17-2020, 04:05 AM   #19
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Quote:
Originally Posted by themur View Post
Unplugging it won't throw any errors and you can wrap the plug and socket with electrical tape to keep it safe from the elements.
I did this mod to a UK car and a couple of days ago it threw a CEL after approx. 1,500 miles of driving with the mod. Took it to the dealer they said the mod was causing low pressure to the OPF, below the required threshold and that it could cause long term damage to the exhaust system. Dealer put the exhaust back to factory and did a 30 minute drive at 60mph+, no CEL now. I have asked the dealer for the code.

I'm no mechanic but this seems odd to me. I watched a video of a Belgian owner (with OPF) who has done the same mod, 20,000km and no CEL for him. I will likely redo the mod and get a reader to check the code for myself if it were to happen again. I can't find any other instance of someone reporting this issue.

Has anyone else had a similar problem or got any advice?

Thanks
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      07-17-2020, 05:41 AM   #20
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Quote:
Originally Posted by G_046 View Post
Quote:
Originally Posted by themur View Post
Unplugging it won't throw any errors and you can wrap the plug and socket with electrical tape to keep it safe from the elements.
I did this mod to a UK car and a couple of days ago it threw a CEL after approx. 1,500 miles of driving with the mod. Took it to the dealer they said the mod was causing low pressure to the OPF, below the required threshold and that it could cause long term damage to the exhaust system. Dealer put the exhaust back to factory and did a 30 minute drive at 60mph+, no CEL now. I have asked the dealer for the code.

I'm no mechanic but this seems odd to me. I watched a video of a Belgian owner (with OPF) who has done the same mod, 20,000km and no CEL for him. I will likely redo the mod and get a reader to check the code for myself if it were to happen again. I can't find any other instance of someone reporting this issue.

Has anyone else had a similar problem or got any advice?

Thanks
I have the code you are looking for written down at home. I found it using Bimmer Link. I'll post here tonight. I've had mine unplugged for -5000 miles and it hasn't thrown a CEL.
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      07-17-2020, 12:24 PM   #21
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Quote:
Originally Posted by M340_pilot View Post
Quote:
Originally Posted by G_046 View Post
Quote:
Originally Posted by themur View Post
Unplugging it won't throw any errors and you can wrap the plug and socket with electrical tape to keep it safe from the elements.
I did this mod to a UK car and a couple of days ago it threw a CEL after approx. 1,500 miles of driving with the mod. Took it to the dealer they said the mod was causing low pressure to the OPF, below the required threshold and that it could cause long term damage to the exhaust system. Dealer put the exhaust back to factory and did a 30 minute drive at 60mph+, no CEL now. I have asked the dealer for the code.

I'm no mechanic but this seems odd to me. I watched a video of a Belgian owner (with OPF) who has done the same mod, 20,000km and no CEL for him. I will likely redo the mod and get a reader to check the code for myself if it were to happen again. I can't find any other instance of someone reporting this issue.

Has anyone else had a similar problem or got any advice?

Thanks
I have the code you are looking for written down at home. I found it using Bimmer Link. I'll post here tonight. I've had mine unplugged for -5000 miles and it hasn't thrown a CEL.
Thanks that would be great.

The technician advised it was low pressure at the OPF. Dealer has sent the part of the paperwork through, don't know why they couldn't send the whole document through. Would these codes seem correct? From looking around it seems only my car has thrown a CEL by doing this mod so can't help but think it may be something else.

CEL only came on after 1,500 miles and on the day, after a 45 minute drive across country, seems strange to suddenly be an issue.

Thanks for the help
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      07-17-2020, 03:45 PM   #22
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138104 is the exhaust flap open circuit fault code. That one shouldn't give you a CEL. I've had that one (among others) since I unplugged the flap. It must've been one of the others.
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