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      03-24-2023, 09:57 AM   #1
yoandry
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DIY M50i AA Downpipes

Here is a separate DIY thread for M50i AA DP Installation.
Ok, here is how it went on my install. Not that easy as I thought. I did better the H&R springs installation, so you have an idea.

So, here is the bad first

- You need to an extra pair of hands to take the dp out and in after all connections are lose. One from top and the other under.

- There is major flaw on these AA DPs on the second sensor location, that doesnt line up with the lower back oem heat shield hole. And i found out that after everything was pretty much installed. I was like wdf did I do wrong. So, my guess was that, either you bend, make new hole or dont install the heatshield. So I bend it as I had it bolt on already and it wasn't that easy. So if you want, you dont have to install it back but not sure about the negative effect if there is any. See pictures below. from 17 to 20 and last 2.
I contacted AA on this matter. They answered that you need to cut that heat shield corner or not install it. Or do what I did just bend it a little.
Picture 1- Remove the top part of the intake.
Picture 2- Remove the bottom part of the intake, no screws. just pull up.
Picture 3- Remove the 2 tops O2 sensors and top heat shield. There is 4 screes on each side and one in the middle. Only remove completely the last one on each side, the rest just lose them a bit. See also picture 16.
Picture 4- Remove the dp clamps and the 3 other bolts of a bracket that secure the dp. FYI, OEM DP has 3 options to secure them and AA only has 1. See picture 10.
Picture 5- Time to go under the car and remove everything that needs to be remove. remove the metal and plastic covers.
Picture 6 and 7 Remove the exhaust claps. Right side dp lower bracket has 4 screws to remove. Left side has only 2 nuts on a fix bracket. Pain in the ass to remove. On both side the is also 1 screw to remove the lower heat shield and undo the other side that just slide. Couldn't get a picture of it but you will notice.
Picture 7.1- Remove the 2 screws that hold the exhaust before the muffler. So it will be easy to remove the DP from the exhaust where the clamps are.
Picture 8- Now from the top need to remove that pain in the ass lower heat shield. It has 3 screws total, The one you just took from the bottom, a hidden one where the arrow is and one in the middle holding both sides. That last one is different one and it stays on the right side shield.
Picture 9- Now with that lower shield remove you have access to another secure bracket with 2 bolts that hold the dp. See picture 10 for reference.
Picture 11- In order to remove the dp, I had to remove the top plastic as the driver side didn't want to go. These are the part you may need another hand to guide it from underneath.
Picture 12 and 13. Finally remove. Time for a beer and rest.
Picture 14 and 15 Get new dp in. Need 2 people to guide again from underneath and slide in to exhaust a bit. Start with the turbo clamps, pain in the ass even with 2 people, lol. Make sure the driver side braket are in the fixed bolts but not tight. After clam are on but not that tight either, then do the bracket bolts underneath. You need 2 new bolts, nuts and washer for the passenger side that use the bracket as the OEM dp has the nuts fixed. Or find new nuts that work with the oem bolts. But it maybe difficult as they are short.
Now you decide if want to put the lower heat shield or not. If you do, then as you are underneath better put that screw on both sides.
Picture 16- You can see the lower heat shield on and top heat shield screws. At that time I didn't notice that the back OS sensor was covered already under the lower heat shield. Otherwise I would have made the bend or hole when off the car.
Picture 17-20 Put the top heat shield and and work with the sensors. for the driver back sensor has to pull the cable longer as it wont reach .Thanks god the cable is long enough and just needed to be lose a bit.

You can see in the last pic that the back O@ sensor on the AA dp is at the flex portion and the OEM is actually at the big fat part. Heck they don't line up with the shield holes.

Well that's it. oh wait a bonus video after install of the heat wrap burning like hell. lol

https://photos.app.goo.gl/69u32SLJZEzpGMgj6

Cold Start Vid.


Sorry if something is not perfectly written or misspelling.
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Last edited by yoandry; 03-24-2023 at 10:02 AM..
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      03-24-2023, 11:45 AM   #2
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Wow great DIY. Thanks for the play by play.
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      03-27-2023, 10:48 AM   #3
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Thank you
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      03-28-2023, 06:12 PM   #4
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Great DIY. Enjoy the extra horses.
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      04-14-2023, 10:28 AM   #5
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Quote:
Originally Posted by mike@x-ph.com View Post
Thank you
FYI, After 200 miles I got the CEL on the AA Catted DP. No bueno. Now, I'm not sure if these code are the regular one you get when installing DP or it is actually something else rerated with the O2 sensors.

mike@x-ph.com Can you take a look on this, I could not be the only one that the AA catted DP throw the CEL
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      04-14-2023, 10:59 AM   #6
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Quote:
Originally Posted by yoandry View Post
FYI, After 200 miles I got the CEL on the AA Catted DP. No bueno. Now, I'm not sure if these code are the regular one you get when installing DP or it is actually something else rerated with the O2 sensors.

mike@x-ph.com Can you take a look on this, I could not be the only one that the AA catted DP throw the CEL
you might have gotten a bad GESI cat, reach out to active and they will replace the downpipe for free.
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      04-14-2023, 12:15 PM   #7
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Quote:
Originally Posted by mike@x-ph.com View Post
you might have gotten a bad GESI cat, reach out to active and they will replace the downpipe for free.
Yeap, I just did and they are putting another order and thanks God I'm 2hs away from them and I will go so they can do the swap. uff, I didnt want to do the install all over again lol
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      04-14-2023, 02:42 PM   #8
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Quote:
Originally Posted by yoandry View Post
Yeap, I just did and they are putting another order and thanks God I'm 2hs away from them and I will go so they can do the swap. uff, I didnt want to do the install all over again lol
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      08-25-2023, 02:32 PM   #9
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Quote:
Originally Posted by yoandry View Post
Yeap, I just did and they are putting another order and thanks God I'm 2hs away from them and I will go so they can do the swap. uff, I didnt want to do the install all over again lol
Any update on the replacement DP? No CEL?
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      08-26-2023, 11:52 AM   #10
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This is one of the if not THE best DIY write up with step by step picks I have ever seen.
Great job man and Thank You!
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      08-27-2023, 10:26 AM   #11
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Quote:
Originally Posted by JAL0988 View Post
Any update on the replacement DP? No CEL?
Unfortunately not yet, I went to AA shop and they took it out and tried to fix the same one but it came back again. Now they gave me a new ones but I have to do the job myself, so they are been seating in my garage all these time till I find some time to do all again. Mmm not fun.
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      08-31-2023, 10:37 PM   #12
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I know where you can find a great tutorial on how to do it.
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      10-18-2023, 11:35 AM   #13
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Any update? Curious to see if the CEL is fixed, thanks!
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      10-18-2023, 12:51 PM   #14
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Any update? Curious to see if the CEL is fixed, thanks!
No yet. I need to find a good weekend.
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