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Suspension & Braking Forum by BimmerWorld
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!
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Old 07-16-2010, 07:40 AM   #1
theinfamousdrew
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M3 rear sway bar

Ok.....im sure this has been beaten to death...but i cant find any info on it


Will a m3 rear sway bar fit on my 330Ci?

and yes i have searched and i have found out that the front sway bar from and m3 will fit....BUT
what about the rear?
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Old 07-16-2010, 08:19 AM   #2
TxZHP04
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No. Not unless you swap the entire M3 rear end with it.
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04 IR 330i ZHP | ESS TS2+ SC | MagnaFlow "headers" | KMS 3.64 LSD | AST 4100 550/650| APEX ARC-8 18x9 | H&R front sway bar | Vorshlag camber plates, RTAB limiters | TMS subframe & swaybar reinforcements | UUC SSK & DSSR | UUC TM & TME | BW motor mounts | Dinan strut & shock tower bars | vaio 4-bolt oil pump
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Old 07-16-2010, 08:22 AM   #3
theinfamousdrew
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sweet....thanks.....im starting to upgrade my suspension and im gonna have a ton of questions...lol
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Old 07-16-2010, 08:45 AM   #4
BMWstudent
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I have a 330i and i have a set of m3 vert sway bars (I figure thats as start of a difference between the chasis as possible, right?)

The front bar fits without a hitch. I used the m3 bushings in the 330's carrier sleeves (not sure what these are exactly called. bushing brackets? thats kinda a lame name)

The rears are almost the exact same shape as each other, but the m3 bar has some flaring at the end to keep it in the end links better (I'm guessing). I just got my bushings in the mail the other day so I'll be installing it today if possible. The real issue comes into play in that the 330's two bushing carriers next to the diff are a good deal smaller than the m3's. I plan to remedy this by using bushing intended for an aftermarket swaybar for a 330 and the standard brackets. (I have a set I got from powerflex)

my plan for the rear: use the 330's end links with the end-link bushings from the m3, use the 330's bushing brackets in the center, and the powerflex bushings.


Give me ten hours and I'll tell you (with photos) if you can do it without excanging the whole rear end. That would be silly.
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Old 07-16-2010, 09:40 AM   #5
nite-stalker
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^^^ have you tried test fitting it first?
on the coupe it does not fit at all, the non-m bar is shaped to clear the differential, the M bar is straight at that section and will not clear the differential, it is not just a bushing issue.
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Old 07-16-2010, 01:23 PM   #6
BMWstudent
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No to test fitting. I'll take a copious amount of pictures though to verify one way or the other.
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Old 07-16-2010, 01:37 PM   #7
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Originally Posted by theinfamousdrew View Post
Ok.....im sure this has been beaten to death...but i cant find any info on it


Will a m3 rear sway bar fit on my 330Ci?

and yes i have searched and i have found out that the front sway bar from and m3 will fit....BUT
what about the rear?
That means you didn't search. Simple answer is no, not without fabrication.
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Old 07-16-2010, 01:46 PM   #8
mvrk10256
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get hotchkiss bars, and never look back.
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Old 07-17-2010, 07:35 AM   #9
BMWstudent
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sedans have the same issue. the m3 bar interferes with the rear-most bracket for the diff on a sedan as well

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Old 07-17-2010, 08:01 AM   #10
theinfamousdrew
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off hand....does anyone know the size of the stock FRONT sway bar?
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Old 07-17-2010, 09:44 AM   #11
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Originally Posted by theinfamousdrew View Post
off hand....does anyone know the size of the stock FRONT sway bar?
23.5mm
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Old 07-17-2010, 09:53 AM   #12
theinfamousdrew
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Thanks.....just wanted to make sure the m3 sway was a real upgrade
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Old 07-17-2010, 11:19 AM   #13
theinfamousdrew
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Can the stock bushing mounts (brackets) be used for the m3?
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Old 07-17-2010, 11:21 AM   #14
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fronts, yes
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Old 07-17-2010, 11:29 AM   #15
theinfamousdrew
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Thanks for everyones help!
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