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      05-06-2020, 06:06 PM   #1
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Downpipe Compatibility -- May Be Great News For X5 Owners

I have been looking at doing downpipes and a tune for my X5 M50i. A lot of us are, but the options aren't great to this point and there are more questions than answer. However, there are tons of downpipe options for many of the M550 and M850 crowd. If you contact many of these manufacturers, there are some questions about fitment for the G05 X5 50i and M50i. It got me digging and I spent some time finding the stock part number for the X5 50i / M50i downpipes and what models share the same part numbers. What I found is extremely good news. Here are the part numbers and compatibility charts.

What you will notice is that the 2019/20 G05 X5 50i & 2020 X5 M50i share the same part number downpipe as the 2018 550i xDrive and 2020 850i xDrive. I know for a fact there are downpipes for the 2018 550i xdrive, so it appears from this chart that those will fit our vehicle. I am really close to pulling the trigger on a set.
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      05-06-2020, 07:07 PM   #2
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Great find. What are you going to do to suppress the check engine light from not having cats?
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      05-06-2020, 07:47 PM   #3
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Quote:
Originally Posted by 130FeetDeep View Post
I have been looking at doing downpipes and a tune for my X5 M50i. A lot of us are, but the options aren't great to this point and there are more questions than answer. However, there are tons of downpipe options for many of the M550 and M850 crowd. If you contact many of these manufacturers, there are some questions about fitment for the G05 X5 50i and M50i. It got me digging and I spent some time finding the stock part number for the X5 50i / M50i downpipes and what models share the same part numbers. What I found is extremely good news. Here are the part numbers and compatibility charts.

What you will notice is that the 2019/20 G05 X5 50i & 2020 X5 M50i share the same part number downpipe as the 2018 550i xDrive and 2020 850i xDrive. I know for a fact there are downpipes for the 2018 550i xdrive, so it appears from this chart that those will fit our vehicle. I am really close to pulling the trigger on a set.
Thanks for sharing.

I have ARM M550i catless downpipes on my 50i. Perfect fit. Also have the ECU tuned by DME (stage 2). 622 HP and 660 TQ at the crank. I'll be posting something in the coming weeks with more details and information.
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      05-06-2020, 07:51 PM   #4
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Quote:
Originally Posted by JackB316 View Post
Thanks for sharing.

I have ARM M550i catless downpipes on my 50i. Perfect fit. Also have the ECU tuned by DME (stage 2). 622 HP and 660 TQ at the crank. I'll be posting something in the coming weeks with more details and information.
Those are solid numbers. Do you have deltas from dynos? I know that is a lot to ask now with everything going on.

How does the car feel?

Any opinion on the ARM quality?
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      05-06-2020, 07:55 PM   #5
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Quote:
Originally Posted by Alan l. View Post
Great find. What are you going to do to suppress the check engine light from not having cats?
I will do a tune. There are more options than our forums show, so I will likely do some reviews of whatever I choose. We have flash and piggy options right now that work on the 50i/M50i. Most believe just DP and a tune are worth 120-140 rwhp. That is an insane bang for the buck.
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      05-06-2020, 07:55 PM   #6
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Quote:
Originally Posted by 130FeetDeep View Post
Quote:
Originally Posted by JackB316 View Post
Thanks for sharing.

I have ARM M550i catless downpipes on my 50i. Perfect fit. Also have the ECU tuned by DME (stage 2). 622 HP and 660 TQ at the crank. I'll be posting something in the coming weeks with more details and information.
Those are solid numbers. Do you have deltas from dynos? I know that is a lot to ask now with everything going on.

How does the car feel?

Any opinion on the ARM quality?
I have plans of having the car dyno'd in the coming weeks after we adjust fuel ratios and the intake is installed. I'll be sure to share then.

ARM downpipes have been outstanding. Great sound at a more then reasonable price ($350ish). Also did an x pipe in the middle to give the car a nice throaty sound.

With the tune and DP, the power difference is night and day. Feels like a different car.
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      05-06-2020, 08:05 PM   #7
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Quote:
Originally Posted by JackB316 View Post
I have plans of having the car dyno'd in the coming weeks after we adjust fuel ratios and the intake is installed. I'll be sure to share then.

ARM downpipes have been outstanding. Great sound at a more then reasonable price ($350ish). Also did an x pipe in the middle to give the car a nice throaty sound.

With the tune and DP, the power difference is night and day. Feels like a different car.
And you have them on your 2019 X5 50i? Since you share the exact same downpipe as the X5 M50i, that should be the confirmation I need.
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      05-10-2020, 05:45 PM   #8
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Quote:
Originally Posted by 130FeetDeep View Post
I have been looking at doing downpipes and a tune for my X5 M50i. A lot of us are, but the options aren't great to this point and there are more questions than answer. However, there are tons of downpipe options for many of the M550 and M850 crowd. If you contact many of these manufacturers, there are some questions about fitment for the G05 X5 50i and M50i. It got me digging and I spent some time finding the stock part number for the X5 50i / M50i downpipes and what models share the same part numbers. What I found is extremely good news. Here are the part numbers and compatibility charts.

What you will notice is that the 2019/20 G05 X5 50i & 2020 X5 M50i share the same part number downpipe as the 2018 550i xDrive and 2020 850i xDrive. I know for a fact there are downpipes for the 2018 550i xdrive, so it appears from this chart that those will fit our vehicle. I am really close to pulling the trigger on a set.
I've seen Supersprint make a set of down pipes for the 40i and 50i. On the pricier side tho and also Meistershaft makes an exhaust but I haven't seen or heard of anyone who have either of these components. One thing about the exhaust is it doesn't change the tips, looks OEM almost from the picture. Would love to know if any of the 50i owners have either. Kinda don't want to drop that change and be a test piggy. Lol
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      05-10-2020, 05:47 PM   #9
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Quote:
Originally Posted by JackB316 View Post
Thanks for sharing.

I have ARM M550i catless downpipes on my 50i. Perfect fit. Also have the ECU tuned by DME (stage 2). 622 HP and 660 TQ at the crank. I'll be posting something in the coming weeks with more details and information.
Did you install the downpipes before the tune? And the X pipe? Just curious how that change was. Changing the downpipes mess your warranty up right?
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      05-10-2020, 06:42 PM   #10
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Quote:
Originally Posted by G050i View Post
I've seen Supersprint make a set of down pipes for the 40i and 50i. On the pricier side tho and also Meistershaft makes an exhaust but I haven't seen or heard of anyone who have either of these components. One thing about the exhaust is it doesn't change the tips, looks OEM almost from the picture. Would love to know if any of the 50i owners have either. Kinda don't want to drop that change and be a test piggy. Lol
We have multiple confirmations now that the M550i downpipes do work on our truck. That is also confirmed by the compatibility chart above.

Supersprint everything is pricey. That is just the way they roll. There are downpipes for our truck under $400.

As for warranty, know your rights and don’t be bullied by the dealer. My dealer tried to bully me and I explicitly stated the Magnuson–Moss Warranty Act protects me. They have no legal ground to deny warranty service unless they can prove your mod did the damage. Know you rights and do not back down.

Last edited by 130FeetDeep; 05-10-2020 at 10:46 PM..
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      05-10-2020, 08:49 PM   #11
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Quote:
Originally Posted by G050i View Post
Quote:
Originally Posted by JackB316 View Post
Thanks for sharing.

I have ARM M550i catless downpipes on my 50i. Perfect fit. Also have the ECU tuned by DME (stage 2). 622 HP and 660 TQ at the crank. I'll be posting something in the coming weeks with more details and information.
Did you install the downpipes before the tune? And the X pipe? Just curious how that change was. Changing the downpipes mess your warranty up right?
I installed the X pipe first, then tune and downpipes were installed conjointly by the same shop. I wouldn't typically recommend running downpipes w/o a tune for reasons beyond just the CEL light.

And to shadow on 130ftdeep's point, he is absolutely correct. At our law firm, we work partly with this area of the law (lemon law, manufacturer warranty protection, etc.). I'd recommend referencing the Magnuson–Moss Warranty Act of 1975 which was a federal law passed explaining the 13 step process manufacturers much abide to in order to effectively deem ones warranty "voided". Even in the event they are able to, the chances of having your entire warranty voided instead of a portion of it is unlikely. For instance, say you were to tune the car and you blew a part of the engine as a result of pushing too much boost. BMW would most likely void your powertrain warranty while keeping the other portions of your bumper to bumper intact.

And shall I add, what I have provided you is in no way legal advice nor should it be interpreted as such
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      05-10-2020, 09:08 PM   #12
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im interested in catted downpipes due to the smell
either 100 or 200 cell, anything out there? would prob have to go with M550i set up
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      05-10-2020, 10:30 PM   #13
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Quote:
Originally Posted by JackB316 View Post
I installed the X pipe first, then tune and downpipes were installed conjointly by the same shop. I wouldn't typically recommend running downpipes w/o a tune for reasons beyond just the CEL light.

And to shadow on 130ftdeep's point, he is absolutely correct. At our law firm, we work partly with this area of the law (lemon law, manufacturer warranty protection, etc.). I'd recommend referencing the Magnuson–Moss Warranty Act of 1975 which was a federal law passed explaining the 13 step process manufacturers much abide to in order to effectively deem ones warranty "voided". Even in the event they are able to, the chances of having your entire warranty voided instead of a portion of it is unlikely. For instance, say you were to tune the car and you blew a part of the engine as a result of pushing too much boost. BMW would most likely void your powertrain warranty while keeping the other portions of your bumper to bumper intact.

And shall I add, what I have provided you is in no way legal advice nor should it be interpreted as such

Haha thanks for the solid info and the disclaimer at the end is duly noted. Also thanks to 130s input as well.
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      05-10-2020, 10:45 PM   #14
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Quote:
Originally Posted by Tim2189 View Post
im interested in catted downpipes due to the smell
either 100 or 200 cell, anything out there? would prob have to go with M550i set up
M-power did install a 200 cell on a customers car. Cost with cats go up a lot.
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      05-10-2020, 10:51 PM   #15
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Quote:
Originally Posted by 130FeetDeep View Post
M-power did install a 200 cell on a customers car. Cost with cats go up a lot.
is there a link?
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      05-10-2020, 11:09 PM   #16
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Quote:
Originally Posted by JackB316 View Post
I have plans of having the car dyno'd in the coming weeks after we adjust fuel ratios and the intake is installed. I'll be sure to share then.

ARM downpipes have been outstanding. Great sound at a more then reasonable price ($350ish). Also did an x pipe in the middle to give the car a nice throaty sound.

With the tune and DP, the power difference is night and day. Feels like a different car.
Can you post video of the sound?
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      05-10-2020, 11:17 PM   #17
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Quote:
Originally Posted by 130FeetDeep View Post
We have multiple confirmations now that the M550i downpipes do work on our truck. That is also confirmed by the compatibility chart above.

Supersprint everything is pricey. That is just the way they roll. There are downpipes for our truck under $400.

As for warranty, know your rights and don’t be bullied by the dealer. My dealer tried to bully me and I explicitly stated the Magnuson–Moss Warranty Act protects me. They have no legal ground to deny warranty service unless they can prove your mod did the damage. Know you rights and do not back down.
From my understanding, there are 2 diff types of DP for the M550, N63R and N63B

N63R is the for 2017-2019 and not compatible with us
N63B is the current engine in the M550 and M850 and compatible with our M50i
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      05-11-2020, 01:17 AM   #18
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Quote:
Originally Posted by Tim2189 View Post
From my understanding, there are 2 diff types of DP for the M550, N63R and N63B

N63R is the for 2017-2019 and not compatible with us
N63B is the current engine in the M550 and M850 and compatible with our M50i
The part number in this first post show specific part numbers that are used on the 50i/M50i. We have confirmation that the ARM fits the 2019-2020 50i which shares its downpipes per the original post with the M50i.

I am not arguing differences as you noted above, just what we know to this point. We have members running the ARM downpipes on 2019+ 50i and shops confirming they have installed them on M50i.

EDIT: It also looks like you are quoting the same part number.
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      05-12-2020, 07:05 PM   #19
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On a similar note, does anyone know if the 40i downpipe is shared or compatible with other b58 cars? 340i? X3?
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      05-12-2020, 07:23 PM   #20
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Quote:
Originally Posted by atlas View Post
On a similar note, does anyone know if the 40i downpipe is shared or compatible with other b58 cars? 340i? X3?
It appears it is note the same downpipe as other B58, but that doesn't mean they won't fit. I would find an owner than has done it.
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      05-12-2020, 08:59 PM   #21
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Quote:
Originally Posted by 130FeetDeep View Post
The part number in this first post show specific part numbers that are used on the 50i/M50i. We have confirmation that the ARM fits the 2019-2020 50i which shares its downpipes per the original post with the M50i.

I am not arguing differences as you noted above, just what we know to this point. We have members running the ARM downpipes on 2019+ 50i and shops confirming they have installed them on M50i.

EDIT: It also looks like you are quoting the same part number.
Do you know if there is any smell with the ARM DP's?
Thats mostly my main concern as to why I wouldnt want to do hi flow and do catted instead
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      05-13-2020, 09:35 AM   #22
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What is the part number for the arm downpipes for the 50i?
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