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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications G20 M340i downpipes

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      10-02-2019, 02:28 PM   #1
mannymagrips
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G20 M340i downpipes

The G20 M340 has been out for a while, and I still can't find exhaust mods for this car specifically. The G20 330i has an MPE available, but nothing for the 40i. Anybody know if other B58 downpipes or muffler fit on the G20 M340i?
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      10-02-2019, 02:34 PM   #2
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The G20 M340 has been out for a while, and I still can't find exhaust mods for this car specifically. The G20 330i has an MPE available, but nothing for the 40i. Anybody know if other B58 downpipes or muffler fit on the G20 M340i?
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      10-02-2019, 02:35 PM   #3
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The G20 M340 has been out for a while, and I still can't find exhaust mods for this car specifically. The G20 330i has an MPE available, but nothing for the 40i. Anybody know if other B58 downpipes or muffler fit on the G20 M340i?
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      10-02-2019, 04:33 PM   #4
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The rk downpipe for the new Supra are a direct fit.
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      10-03-2019, 08:54 AM   #5
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Quote:
Originally Posted by TheBenchmark View Post
The rk downpipe for the new Supra are a direct fit.
This one?

https://www.rktunes.com/collections/...240i-340i-440i

Rogue Performance also has one:

http://www.rogueperformancesa.com/ro...nce-downpipes/
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      10-03-2019, 09:00 AM   #6
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The one I bought was for the 2020 Supra. I'll post install and sound clips after install. Someone posted an install and sound video of it.
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      10-03-2019, 09:49 AM   #7
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Quote:
Originally Posted by mannymagrips View Post
The G20 M340 has been out for a while, and I still can't find exhaust mods for this car specifically. The G20 330i has an MPE available, but nothing for the 40i. Anybody know if other B58 downpipes or muffler fit on the G20 M340i?
There is an MPE available for the M340i now.


https://www.bmwpartspros.com/oem-par...0i-18302464492
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      10-03-2019, 11:35 AM   #8
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Quote:
Originally Posted by anug View Post
There is an MPE available for the M340i now.


https://www.bmwpartspros.com/oem-par...0i-18302464492
That's interesting, what does it look like?
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      10-04-2019, 09:37 PM   #9
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The Titan Motorsports one for the Supra fits perfectly, definitely a good value too.
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      10-06-2019, 01:49 PM   #10
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Quote:
Originally Posted by Cabby View Post
RK Tunes replied to me saying they're not sure if theirs fits on the M340i. Can you verify that the one you linked works? Thanks!
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      10-07-2019, 07:39 AM   #11
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Here is the link to the Titan Motorsports one, I can personally confirm excellent fitment

http://http://www.titanmotorsports.com/tms-mkv-exh-100.html

They also have one (if not the) quickest Supra out there, so clearly it flows well.
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      10-07-2019, 09:04 AM   #12
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Quote:
Originally Posted by bimmer813 View Post
Here is the link to the Titan Motorsports one, I can personally confirm excellent fitment

http://http://www.titanmotorsports.com/tms-mkv-exh-100.html

They also have one (if not the) quickest Supra out there, so clearly it flows well.
Do you have sound videos?
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      10-10-2019, 03:48 PM   #13
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We've got a G series B58 downpipe available now. The catted version is still in development but should be available shortly.

https://www.vr-speed.com/vrsf-b58-do...0-g22-g26.html
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      10-10-2019, 06:17 PM   #14
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Quote:
Originally Posted by Tiago@VRSF View Post
We've got a G series B58 downpipe available now. The catted version is still in development but should be available shortly.

https://www.vr-speed.com/vrsf-b58-do...0-g22-g26.html
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      10-11-2019, 07:37 AM   #15
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Evolution Racewerks just posted theirs on their website as well as posted a video on Instagram of the catless sound (non-cold start)
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      10-11-2019, 10:31 AM   #16
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Quote:
Originally Posted by raptorapture View Post
Evolution Racewerks just posted theirs on their website as well as posted a video on Instagram of the catless sound (non-cold start)
Nice!
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      10-11-2019, 11:41 AM   #17
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I've never understood these "high flow cats". Are they able to pass emissions standards at MOTs? If not, what is their purpose over a catless downpipe?

I'm in the process of getting an M340i and I see the forums exploding here about downpipes but I couldn't, with good conscience, drive the car on public roads without a cat, I'd be too paranoid all the time. (I live in Europe, so things are much stricter about exhausts here)

Could someone enlighten me on this, would be much appreciated
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      10-11-2019, 11:46 AM   #18
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Quote:
Originally Posted by SemtexGT View Post
I've never understood these "high flow cats". Are they able to pass emissions standards at MOTs? If not, what is their purpose over a catless downpipe?

I'm in the process of getting an M340i and I see the forums exploding here about downpipes but I couldn't, with good conscience, drive the car on public roads without a cat, I'd be too paranoid all the time. (I live in Europe, so things are much stricter about exhausts here)

Could someone enlighten me on this, would be much appreciated
1- No fuel smell
2- quieter than catless
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      10-11-2019, 12:05 PM   #19
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Quote:
Originally Posted by mike@x-ph.com View Post
1- No fuel smell
2- quieter than catless
I see. Thanks for the quick response.

Guess I'll stick with the stock one and just get a cat-back exhaust
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      10-11-2019, 01:50 PM   #20
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Quote:
Originally Posted by SemtexGT View Post
I see. Thanks for the quick response.

Guess I'll stick with the stock one and just get a cat-back exhaust
Let me know if i can help once you are ready for the catback system
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      10-11-2019, 02:13 PM   #21
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When there will be an Akrapovic system, I'll be all over it
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      11-01-2019, 01:14 AM   #22
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Quote:
Originally Posted by SemtexGT View Post
I've never understood these "high flow cats". Are they able to pass emissions standards at MOTs? If not, what is their purpose over a catless downpipe?

I'm in the process of getting an M340i and I see the forums exploding here about downpipes but I couldn't, with good conscience, drive the car on public roads without a cat, I'd be too paranoid all the time. (I live in Europe, so things are much stricter about exhausts here)

Could someone enlighten me on this, would be much appreciated
There are catted "sports" downpipes for N55 and B58 which are ECE approved (legal with in EU zone). In fact I have ECE compliant downpipe from akrapovic in my 2017 440i. The G20 version is yet to be released. The problem is that new cars have also OPFs and not only cats here in EU. The OPF is actually located after the cat around midpipe. OPF is restricting exhaust flow atleast as much as cat is. To remain emissions compliant in Europe you need to have OPF in place for B58's produced after July 2018.

I really hope akrapovic does create ECE approved full exhaust system including downpipe and OPF for M340i. I'm sure this will be super expensive though...
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