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      08-15-2019, 08:17 AM   #1
habib86
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m40i downpipe

have been searching everywhere for catless downpipe for the m40i and with no luck ... but found 1 for the new supra made by boost logic.

is the downpipe on the supra identical to the 1 on the m40i?

was not able to find the part number for the downpipe of the supra just the m40i and found diagram for both and they look the same .
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      08-15-2019, 08:52 AM   #2
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There is this video on YouTube of a 2020 Supra being fitted with an exhaust downpipe.

To me it sounds a little tacky.

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      08-15-2019, 03:42 PM   #3
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rk tunes and boost logic sells them for the 2020 supra ... need a confirmation if its the same part as the bmw dp so i can pull the trigger on one 😁


the G20 M340i has the same dp (same part number) and seems no 1 makes for it a DP so far

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      08-18-2019, 08:56 PM   #4
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No one has test fit the current b58 DPs as of yet. Unfortunately, I sold my m240i with the DS-1 sport cat DP because it was welded to the Remus exhaust. Debating on spending the $300 for the VR catless DP for the b58 and see if it fits. I'm going to guess it won't but haven't gotten under the car to get a better look. The Supra video looks like the downpipe exits at a slight turn whereas the m240i didn't. Again, might just have to bite the bullet and find out.
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      08-20-2019, 05:11 AM   #5
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just got an email from Jose Castillo at Boost logic saying :


"We believe that it will fit but we have not tested the fitment yet."


and theres a tune from MHD for the g29 Z4 and a drop filter by BMC


so guess im all set 😁
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      08-20-2019, 07:36 AM   #6
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Let us know how it turns out! I've been back and forth with performance mods and wheels/tires. Already have issues putting power down so at least new tires are in order IMO before more power.
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      08-20-2019, 09:49 AM   #7
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euro spec m40i downpipe is different that the us spec ons 😭


euro spec has the Petrol particul filter and the connection to the mid pipe seems to be different
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      09-17-2019, 04:01 AM   #8
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just ordered a downpipe from supersprint and a bmc drop filter ... cant wait to see how much the b58 will be making ... will be posting dyno before and after the installation and tune
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      09-17-2019, 07:14 AM   #9
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I'm really surprised that the EU spec m40i uses a vband clamp on both ends, whereas the US spec m40i uses vband only on the turbo side with a slip/clamp on the catback side.
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      09-17-2019, 10:58 AM   #10
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Quote:
Originally Posted by Joe240 View Post
I'm really surprised that the EU spec m40i uses a vband clamp on both ends, whereas the US spec m40i uses vband only on the turbo side with a slip/clamp on the catback side.
that took me alot of research to know .... apparently the eu spec has a petrol particular filter ( its that small straw coming from the downpipe upper side ) and the HP power is less (340 )
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      09-17-2019, 11:48 AM   #11
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Good luck! Looking forward to the sound and hp gains. Is it catted or catless?
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      09-18-2019, 12:35 AM   #12
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Quote:
Originally Posted by ToysArs View Post
Good luck! Looking forward to the sound and hp gains. Is it catted or catless?
catless
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      09-25-2019, 10:27 PM   #13
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habib86 any updates on this? Excited to hear how car will sound after catless downpipes!!
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      10-01-2019, 02:33 AM   #14
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Quote:
Originally Posted by ToysArs View Post
habib86 any updates on this? Excited to hear how car will sound after catless downpipes!!
sorry was on vacation ... parts have all arrived and soon will be posting an update and sound clips and dyno runs before and after
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      10-01-2019, 12:51 PM   #15
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Can't wait to hear the sound!!
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      10-02-2019, 12:30 PM   #16
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Quote:
Originally Posted by Joe240 View Post
No one has test fit the current b58 DPs as of yet. Unfortunately, I sold my m240i with the DS-1 sport cat DP because it was welded to the Remus exhaust. Debating on spending the $300 for the VR catless DP for the b58 and see if it fits. I'm going to guess it won't but haven't gotten under the car to get a better look. The Supra video looks like the downpipe exits at a slight turn whereas the m240i didn't. Again, might just have to bite the bullet and find out.
I was emailing RK Tunes and they told me their Supra DP is not good for the m40 and they told me to order their downpipe for B58 340. See the link below.

https://www.rktunes.com/collections/...240i-340i-440i
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      10-02-2019, 12:33 PM   #17
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My only concern is whether I will get a CEL or not. I'm not ready to flash the car yet
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      10-02-2019, 02:11 PM   #18
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With a cat less DP you will definitely get a CEL. With a sport car DP it can be 50/50. Usually an O2 spacer helps if it shows up
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      10-04-2019, 05:08 AM   #19
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Quote:
Originally Posted by Joe240 View Post
With a cat less DP you will definitely get a CEL. With a sport car DP it can be 50/50. Usually an O2 spacer helps if it shows up
thats why im waiting on bootmod3 as thy will send me a stage 2 tune ( so no cel since its tuned )

if ur getting a downpipe u might as well tune the car as well
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      10-04-2019, 05:34 PM   #20
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Quote:
Originally Posted by habib86 View Post
thats why im waiting on bootmod3 as thy will send me a stage 2 tune ( so no cel since its tuned )

if ur getting a downpipe u might as well tune the car as well
I contacted bootmod3 guys and they told me they currently don't have a timeline for z4 m40 release. Did you hear differently?

Aras
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      10-04-2019, 06:00 PM   #21
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Mission performance has a tune for the M40i z4 and apparently so does MHD
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      10-07-2019, 01:25 AM   #22
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Quote:
Originally Posted by ToysArs View Post
I contacted bootmod3 guys and they told me they currently don't have a timeline for z4 m40 release. Did you hear differently?

Aras
i contacted them and was told to buy a B58 bootmod3 license and thy will add a OTS map later on for me .... just got the tune today so its off to the garage to get the downpipe installed finally
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