[slinkygn]

So I'm looking to replace my front sway bar bushings on my E90 335i sport. Planning to stick to stock (-ish) parts.

Why "-ish?" Well, because my options are:

1. The stock E90 sway bar bushings, pn 31356765574
2. The "improved" E90 bushings, from SIB 310109 supposed to get rid of squeaks in low temperatures, pn 31306778064
3. The M3 bushings -- since I have the sport suspension, as I understand it the M3 and 335i front sways are the same diameter, and some folks seem to sell this as an "upgrade." pn 31352283516/31352283517, I think these also need different brackets but I'm guessing they must fit the 335i subframe fine or reputable folks wouldn't be selling it as an upgrade

I can't find many people that have experience with option 3, and none so far at all with experience with option 2 (apparently there's not much around about SIB 310109 at *all* online). Can anyone chime in with their experience with either of these?

Not really sure what you're asking, but you seem to be confused about non-M vs M sway bar differences:
https://www.turnermotorsport.com/t-t...sway-bars.aspx

As for bushings, there are poly versions, BMW MS versions, etc.:
http://www.turnermotorsport.com/p-31...0-e92-e82.aspx

Replacing just the bushings themselves though is probably a waste of time...look into upgrading the entire sway bar instead. It's not that expensive and will actually make an appreciable difference.

[slinkygn]

Originally Posted by FCobra94

Not really sure what you're asking, but you seem to be confused about non-M vs M sway bar differences:
https://www.turnermotorsport.com/t-t...sway-bars.aspx

I know that link well -- and have always found it odd that they don't mention the 335i M-Sport sway bar. Pretty sure the M-sport suspension uses the same sway bar size as the M3 (aka no taper). I'll put it back on the lift today or tomorrow to verify, but I've seen that mentioned elsewhere as well.

I'm looking to just replace the bushing because that's what's worn. No aftermarket parts, just considering the three I listed as I mentioned. Either back to "standard" (option #1), or the "improved" standard #2 or M3 version #3.

So what I'm asking is, I am looking for opinions from people that have tried options 2 or 3. (I can't find anyone in the forums that's even mentioned ordering the part in option #2 that fixes the issue in the SIB I mentioned, which I find odd.)

[peterparker]

No mention of the 335i M-Sport sway bar because 335i M-Sport has the same sway bar as 335i.

Just buy the the OEM bushings (Option #1), I never heard of Option #2.

As for Option #3, You will need different brackets and it will bolt up to the subframe. Then as slinkygn mentioned, you might as well get the M3 sway bar kit.

[feuer]

Originally Posted by slinkygn

I know that link well -- and have always found it odd that they don't mention the 335i M-Sport sway bar. Pretty sure the M-sport suspension uses the same sway bar size as the M3 (aka no taper). I'll put it back on the lift today or tomorrow to verify, but I've seen that mentioned elsewhere as well.

I'm looking to just replace the bushing because that's what's worn. No aftermarket parts, just considering the three I listed as I mentioned. Either back to "standard" (option #1), or the "improved" standard #2 or M3 version #3.

So what I'm asking is, I am looking for opinions from people that have tried options 2 or 3. (I can't find anyone in the forums that's even mentioned ordering the part in option #2 that fixes the issue in the SIB I mentioned, which I find odd.)

I have M-tech, presumably same as M-sport, and the sway bar is different than M3 e90/92.
The shape is identical as M3 e93 sway bar only narrower.
Additionally, the M3 sway bars have a bushing stop that prevents the bar to slide left and right.

You can install M3 e93 bushings on non-M sway bar but I assume there won't be any benefit from doing it.
They fit the subframe just fine.

I hope I answered your question.

[Volasko]

In reference to your title, they aren't this hard you're just make it so! Buy OEM bushing, swap them yourself (easy!) and never think about this again. Honestly the 0.0000001% difference there might be won't be noticeable to you. If your bushings are worn new OEM bushings will make more of an improvement than obsessing about upgrading this one VERY small aspect of your suspension.

Only by swapping the actual bar will you notice a difference. Also make sure you don't over tighten the bolts that hold the bushing brackets, I learned this the hard way and it was a total PITA to get it fixed.

[slinkygn]

M-Tech doesn't receive the M-sport suspension.
http://www.e90post.com/forums/showthread.php?t=418086

I'm not surprised many hadn't heard of "option 2." More on that:
http://www.e90post.com/forums/showpo...5&postcount=24

[slinkygn]

The full text of SIB 310109, which talks about the "improved" bushings that for some reason don't show up on realoem.com:

SI B 31 01 09
Front Axle
February 2009
Technical Service

SUBJECT
Creaking or Groaning Noise During Compression and/or Rebound of Front Axle

MODEL
E82, E88, E90, E91, E92, E93 except M3

SITUATION
A grating or groaning noise is heard when the front axle compresses and/or rebounds. This may be heard particularly over speed bump-type surfaces. The noise normally occurs at lower outside temperatures. The noise may be less prevalent when the vehicle has been driven up to the operating temperature.

CORRECTION
Replace the front sway bar bushings with the improved parts. Important: Only lubricate with water to assist in the installation of the new bushings.

PARTS INFORMATION

Part Number Description Quantity
31 30 6 778 064 Stabilizer Rubber Mounting (all w/2WD) 2
31 30 6 778 066 Stabilizer Rubber Mounting (E9x w/AWD) 2

WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.

Defect Code: 31 35 02 39 00
Labor Operation: 31 35 021*
Labor Allowance: 7 FRU
Description: Replace both rubber mounts

*Main Work - use this labor operation number when this is the only repair being performed, or if this is the main repair when performed along with other repairs at the same time. If this is not the main repair, refer to KSD for the associated (+) labor operation code.

[feuer]

Originally Posted by slinkygn

M-Tech doesn't receive the M-sport suspension.
http://www.e90post.com/forums/showthread.php?t=418086

I have e90 pre lci m-tech and the car is lower the regular sport package car. The sprigs are different to identically equipped sport package car. They are one number lower, like D7 on sport and mine m-tech has D6.

[chris82]

Just replace with the stock part. This will make zero difference in anything

[slinkygn]

Super late followup -- replaced with the upgraded part from the TSB rather than the RealOEM-defined stock. Certainly did get rid of some front-end chatter as the TSB hinted at, and feels a little tighter up front as an added bonus; how much of that is the part and how much is just that it's new is of course impossible to know, but an updated version of the TSB does note that the updated part is vulcanized and the original part isn't, so perhaps that has something to do with it. Almost makes me wish I'd gone with option 4, Turner's BMW Motorsport version (31358300884)...