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      05-24-2013, 12:19 PM   #1
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135i Convertible Downpipe Install Issue

I'm attempting to install downpipes on a 135i convertible and I'm having trouble with the convertible specific under body bracing. I can't fully remove the e12 bolts securing the steering rack. I've tried loosening prying the underbody brace to remove them and I'm having no luck. How involved is it to remove the bracing? Is there a DIY for convertibles? Can you install DP's without relocating the steering rack? Any help would be appreciated.



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      05-24-2013, 06:32 PM   #2
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I'm doing mine next week... Tuned in
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      05-24-2013, 07:39 PM   #3
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If your not a mechanic I would suggest taking it to a shop. It's very hard to put DP's on that car.
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      05-25-2013, 08:14 AM   #4
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Those braces are a pain. I had the same issue trying to install an exhaust - and just ended up getting frustrated and not doing it
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      05-25-2013, 10:20 AM   #5
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Yeah..I installed long tube headers on my corvette Z06 just a couple months ago, and I thought this would've been a walk in the park compared to that. I'm mechanically inclined and willing to take the bracing off if I know it can go back on without problems.
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      05-25-2013, 10:25 AM   #6
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Quote:
Originally Posted by Rainers View Post
Yeah..I installed long tube headers on my corvette Z06 just a couple months ago, and I thought this would've been a walk in the park compared to that. I'm mechanically inclined and willing to take the bracing off if I know it can go back on without problems.
With the bracing. So long as the car is square on whatever lift its on...typically you can remove and install the bracing at will because the car isn't using them as tension members when its unloaded.

You need to remove the front bracing in order to put in a front swaybar too.


Id say find a lift though...its not something you want to do on floor ramps as the suspension is loaded at that point.
Each bracer bar has four bolts holding them in. They're Descending 18mm, 17, 16, and 15 if I remember right.

You undo all the bolts and then slide the braces towards the front of the car to remove them. You do not need to remove the second undertray (the one under the passenger compartment) to get them out.

Last edited by BrokenVert; 05-25-2013 at 10:32 AM. Reason: clarity
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      05-29-2013, 02:15 AM   #7
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Quote:
Originally Posted by BrokenVert View Post
With the bracing. So long as the car is square on whatever lift its on...typically you can remove and install the bracing at will because the car isn't using them as tension members when its unloaded.

You need to remove the front bracing in order to put in a front swaybar too.


Id say find a lift though...its not something you want to do on floor ramps as the suspension is loaded at that point.
Each bracer bar has four bolts holding them in. They're Descending 18mm, 17, 16, and 15 if I remember right.

You undo all the bolts and then slide the braces towards the front of the car to remove them. You do not need to remove the second undertray (the one under the passenger compartment) to get them out.
Thank you very much, Headed back into the car tonight. Hopefully progress!
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      06-02-2013, 11:09 AM   #8
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Had to delay it a bit due to a hastily planned trip but tackled it last night. I supported the car using the 4 jack stand points and removed the convertible bracing. Easily followed any of the DP install DIYs after that point. Thanks again!
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      06-03-2013, 10:01 AM   #9
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On a lift the braces came off no problem. Install was a breeze.
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      05-28-2014, 09:11 PM   #10
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Quote:
Originally Posted by BrokenVert View Post
Each bracer bar has four bolts holding them in. They're Descending 18mm, 17, 16, and 15 if I remember right.
In case someone finds this thread (as I did) regarding the bracing, it's 18,16,16,18. I torqued them all to 50Nm per another forum member.
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      05-29-2014, 06:13 PM   #11
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I have a vert as well and have yet to do dp. Are you n54 or n55? I know for n54 you got to drop the steering rack. Didn't think it was that necessary for n55
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