F10 550i (2) Different Downpipes?!?!?!

m3gasm · 01-13-2017, 11:04 PM

Hello Everyone,
So I have purchased some downpipes for my 550i, it's Dinan Stage 3.. And I noticed after recieving the wrong downpipes, that there are 2 different types?
I've searched for HOURS, looking to see why BMW has made 2 different types of downpipes (OEM) and can't find any research on it.

To start off, my 550i is 2011..
Now, my stock downpipes (With catalytic converter) do not have a 2 bolt flange at the bottom, they slide into the midpipe under the car.
OEM part number (18327645441, 18327645440)
Pic is for example:

The downpipes i've ordered.. Have a 2 bolt flange, now i was curious to see if this was a (year) problem, and it was my mistake, or if bmw has made changes mid year etc.
OEM part number (18327645235, 18327645234)
Pic is for example:

When you look at downpipes online, from various venders, they either have a set with the flange, or a set without the flange, but no description to anything about it.

I'll order the correct ones, however I'm now just curious on why the change.

Can anyone please explain??

Thanks,
-Steven

550Reasons · 01-14-2017, 06:27 PM

I believe 550s production date before 3/11 use the flanges, my 11 550i uses the flanges since it was a late 2010 build.

SLVSRFR · 01-15-2017, 10:48 AM

Starting 04/11 Production Date BMW started using the slip on downpipes. However, some 04/11 Prod Date 550's still have flange style so it's best to check your downpipe connection underneath if your production date is in the month of 04/11. Anything after that uses the slip on.

m3gasm · 01-18-2017, 02:49 PM

Quote:

Originally Posted by SLVSRFR

Starting 04/11 Production Date BMW started using the slip on downpipes. However, some 04/11 Prod Date 550's still have flange style so it's best to check your downpipe connection underneath if your production date is in the month of 04/11. Anything after that uses the slip on.

Thank you!

mike@x-ph.com · 01-19-2017, 02:16 PM

Quote:

Originally Posted by SLVSRFR

Starting 04/11 Production Date BMW started using the slip on downpipes. However, some 04/11 Prod Date 550's still have flange style so it's best to check your downpipe connection underneath if your production date is in the month of 04/11. Anything after that uses the slip on.

+1

We offer both versions with the Active Autowerke downpipe

01-13-2017, 11:04 PM	#1
m3gasm Lieutenant 122 Rep 451 Posts Drives: 09'M3, 16'M3, 11'550i, 17'X5 Join Date: Dec 2014 Location: Corona, CA iTrader: (2) Garage List 2009 BMW M3 [0.00]	F10 550i (2) Different Downpipes?!?!?! Hello Everyone, So I have purchased some downpipes for my 550i, it's Dinan Stage 3.. And I noticed after recieving the wrong downpipes, that there are 2 different types? I've searched for HOURS, looking to see why BMW has made 2 different types of downpipes (OEM) and can't find any research on it. To start off, my 550i is 2011.. Now, my stock downpipes (With catalytic converter) do not have a 2 bolt flange at the bottom, they slide into the midpipe under the car. OEM part number (18327645441, 18327645440) Pic is for example: The downpipes i've ordered.. Have a 2 bolt flange, now i was curious to see if this was a (year) problem, and it was my mistake, or if bmw has made changes mid year etc. OEM part number (18327645235, 18327645234) Pic is for example: When you look at downpipes online, from various venders, they either have a set with the flange, or a set without the flange, but no description to anything about it. I'll order the correct ones, however I'm now just curious on why the change. Can anyone please explain?? Thanks, -Steven __________________ 2009 Grigio Telesto M3 DCT. ESS 700, BPM Tuned, GTS Tune w/ Euro MDM, Catless custom exhaust, TE37SL/Rays G07EX, Amuse Ericsson Bumper, CSL Carbon Trunk 2016 M3. JB4, VRSF Downpipes, Custom exhaust, Cornfed 2011 550i. Dinan Stage 3, JB4 Piggyback, Catless Downpipes, Custom Exhaust 2017 X5 35i. STOCK, boring, and sold!
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01-14-2017, 06:27 PM	#2
550Reasons Captain 150 Rep 738 Posts Drives: F10 550i Join Date: Aug 2014 Location: South Florida iTrader: (1)	I believe 550s production date before 3/11 use the flanges, my 11 550i uses the flanges since it was a late 2010 build. __________________ 2011 550i 2013 M5 2014 M5 CP 2016 550i
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01-15-2017, 10:48 AM	#3
SLVSRFR Captain 245 Rep 785 Posts Drives: BMW 550i Join Date: May 2015 Location: SoCal iTrader: (0)	Starting 04/11 Production Date BMW started using the slip on downpipes. However, some 04/11 Prod Date 550's still have flange style so it's best to check your downpipe connection underneath if your production date is in the month of 04/11. Anything after that uses the slip on.
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