Exhaust Rattle

135i_Vert · 06-27-2017, 06:51 PM

Hey guys so I installed my downpipe and now there is a pretty bad rattle. I've heard it before the install but not as bad. After looking into it I see that I am missing a bolt (the arrow in one of the pics), to what appears to be some sort of mount or brace for the rear suspension maybe... it's a "V" shape mount. About 2 1/2 feet long on both sides.

The question is, instead of finding another bolt to tighten it down; could I just remove the whole "V" shaped metal mount completely off? By taking it off will it cause issues? What is this "V" shaped mount for exsactly? I feel like there would be no rattling whatsoever with it off. And it doesn't seem like it does much other than minor support. But I could be wrong.

Any feedback will help, thanks guys.

Edit: I have an n55

Juggernaut135i · 06-27-2017, 06:59 PM

NOPPPPEE

it's your wastegate

The sound travels down the exhaust

Welcome to N54

Unless it's an N55...

135i_Vert · 06-27-2017, 07:06 PM

Quote:

Originally Posted by Juggernaut135i

NOPPPPEE

it's your wastegate

The sound travels down the exhaust

Welcome to N54

Unless it's an N55...

It's an n55, sorry should've specified... I basically just wanna know what that mount is for, so I can either just remove it or replace the missing bolt.

Juggernaut135i · 06-27-2017, 07:37 PM

No idea ¯\_(?)_/¯

Neiman Levenson · 06-27-2017, 07:55 PM

ive heard that the x-brace isnt mandatory and can be removed. I have a BMR exhaust and will be lowering my car soon, so Id like to remove the X-brace just for more clearance myself. but im not 100% if it can be removed as some can say it can be and some say differently. following this thread

135i_Vert · 06-27-2017, 08:06 PM

Quote:

Originally Posted by Ne1man35

ive heard that the x-brace isnt mandatory and can be removed. I have a BMR exhaust and will be lowering my car soon, so Id like to remove the X-brace just for more clearance myself. but im not 100% if it can be removed as some can say it can be and some say differently. following this thread

So it's called an X-brace huh? I wonder why, it's more like a "V" to me... anyways thanks for the input. I'll probably wait to see if any more ppl comment on here stating that it's safe to remover or not. or what the actual purpose of it is for!

Neiman Levenson · 06-27-2017, 08:40 PM

Quote:

Originally Posted by 135i_Vert

So it's called an X-brace huh? I wonder why, it's more like a "V" to me... anyways thanks for the input. I'll probably wait to see if any more ppl comment on here stating that it's safe to remover or not. or what the actual purpose of it is for!

yep, its called an x-brace. just noticed your a vert, I think you may have two X-braces? im not sure though, and yes im in for more info as well, hopefully someone will chime in

135i_Vert · 06-27-2017, 09:27 PM

Quote:

Originally Posted by Ne1man35

yep, its called an x-brace. just noticed your a vert, I think you may have two X-braces? im not sure though, and yes im in for more info as well, hopefully someone will chime in

Yeah the one I'm talking about is all the way at the rear of the car. To were other pics I see is more towards the middle of the car right in front of the resenator. Where the bolt is missing in my pic is only like a foot past the rear bumper I can lay down at the end of my car and touch the x brace. Maybe I do have two I'll have to go take another look and see if there is two.

juld0zer · 06-28-2017, 03:41 AM

It's the chassis reinforcement brace because your car has no roof. Do not remove it. Replace the bolt - or all the bolts because they are torque + angle.

Check the bracket on the midpipe near where it connects to the downpipe - assuming the new downpipe still has the pair of outlets like the stock one? Sometimes the Torx bolt is loose and will rattle a lot. Also check for v-clamp interference with the wastegate arm

Stewy_604 · 06-28-2017, 01:26 PM

+1 for add a new bolt and re-diagnose.

06-27-2017, 06:51 PM	#1
135i_Vert Private 20 Rep 76 Posts Drives: 2011 135i convertible Join Date: Nov 2016 Location: texas iTrader: (0)	Exhaust Rattle Hey guys so I installed my downpipe and now there is a pretty bad rattle. I've heard it before the install but not as bad. After looking into it I see that I am missing a bolt (the arrow in one of the pics), to what appears to be some sort of mount or brace for the rear suspension maybe... it's a "V" shape mount. About 2 1/2 feet long on both sides. The question is, instead of finding another bolt to tighten it down; could I just remove the whole "V" shaped metal mount completely off? By taking it off will it cause issues? What is this "V" shaped mount for exsactly? I feel like there would be no rattling whatsoever with it off. And it doesn't seem like it does much other than minor support. But I could be wrong. Any feedback will help, thanks guys. Edit: I have an n55 Attached Images Last edited by 135i_Vert; 06-27-2017 at 07:07 PM..
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06-27-2017, 06:59 PM	#2
Juggernaut135i First Lieutenant 100 Rep 324 Posts Drives: BMW 135i Stage 2 Join Date: Mar 2017 Location: Fort Lauderdale iTrader: (0) Garage List 2008 BMW 135i [0.00]	NOPPPPEE it's your wastegate The sound travels down the exhaust Welcome to N54 Unless it's an N55... __________________ BMW 135i Active Autowerke Charge Pipe, BOV, Intercooler AFE stage 2 intake Macht Schnell Downpipes BC Racing coilovers M3 control arms
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06-27-2017, 07:37 PM	#4
Juggernaut135i First Lieutenant 100 Rep 324 Posts Drives: BMW 135i Stage 2 Join Date: Mar 2017 Location: Fort Lauderdale iTrader: (0) Garage List 2008 BMW 135i [0.00]	No idea ¯\_(?)_/¯ __________________ BMW 135i Active Autowerke Charge Pipe, BOV, Intercooler AFE stage 2 intake Macht Schnell Downpipes BC Racing coilovers M3 control arms
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06-27-2017, 07:55 PM	#5
Neiman Levenson First Lieutenant 258 Rep 373 Posts Drives: 2008 135i M-sport Join Date: Mar 2017 Location: Richmond, Virginia iTrader: (0)	ive heard that the x-brace isnt mandatory and can be removed. I have a BMR exhaust and will be lowering my car soon, so Id like to remove the X-brace just for more clearance myself. but im not 100% if it can be removed as some can say it can be and some say differently. following this thread __________________ 2010 LeMans Blue 6MT M-Sport \| Motiv 800 Single Turbo https://www.youtube.com/c/NeimanLevenson https://www.instagram.com/neiman_levenson/?hl=en
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06-28-2017, 03:41 AM	#9
juld0zer Lieutenant Colonel 480 Rep 1,600 Posts Drives: Prev 135i 7DCT, Now 130i 6sp Join Date: Jul 2016 Location: 2153 iTrader: (0)	It's the chassis reinforcement brace because your car has no roof. Do not remove it. Replace the bolt - or all the bolts because they are torque + angle. Check the bracket on the midpipe near where it connects to the downpipe - assuming the new downpipe still has the pair of outlets like the stock one? Sometimes the Torx bolt is loose and will rattle a lot. Also check for v-clamp interference with the wastegate arm
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06-28-2017, 01:26 PM	#10
Stewy_604 First Lieutenant 77 Rep 310 Posts Drives: 2011 E82 135i M-Sport Join Date: Aug 2015 Location: Vancouver, B.C. iTrader: (0)	+1 for add a new bolt and re-diagnose. __________________ 2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes 2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list
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