[gvisockas]

Hello,

I have decided to fit an e90 m3 rear sway bar to my e90 with an otherwise stock suspension. After dropping the subframe, my mechanic texted me a few pictures showing how the m3 sway bar is touching the top-rear control arm.

I have read here that such a sway bar (regardless of it being e90 or e93 m3) can be fitted to a stock suspension car and have seen an opposing occurrence of a member running into the same control-arm-hitting-swaybar problem. Having that in mind, I decided to create a separate thread so that this could be potentially resolved for upcoming queries.

Does this show any tell-tale signs to any one of you? Thank you in advance. The only option that I can see is to swap in an m3 top-rear control arm that supposedly has more clearance.

(grimy suspension alert)

[Tambohamilton]

You need the M3 upper link too. Found that out the hard way myself.

There is an old thread somewhere that mentions it, but I didn't find it until after I'd fitted mine. But there's no 2 ways about it; the M3 sway (especially e93) cannot fit with the stock non-m links. Issue only exists at full droop, and is fine at ride height.

[gvisockas]

Thank you for a fast reply! Did you change both of them (front and rear) or just the rear one which immediately bumps into the sway bar?

I wonder how did other people succeed to fit it then...

[Tambohamilton]

Originally Posted by gvisockas

Thank you for a fast reply! Did you change both of them (front and rear) or just the rear one, that immediately bumps into the sway bar?

I wonder how did other people succeed to fit it then...

I changed both, but I reckon it'd be fine with just one changed.

I bet others with them fitted already had the m3 arms, or changed them at the same time. Potentially, adjustable sway links could get around the issue?

[Jaronbwall]

I difference between the stock and M3 link is insane from a design/engineering prospective.