Quote:
Originally Posted by Jeef Beef
A popular way to go seems to be to swap out our stock 19mm front sways for the 28mm one from the E92 M3. Of course, you also want to get the bushings and brackets too. Front is more urgent as it does a lot to dial out the understeer - however you should follow with more extensive suspension mods after.
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The OEM front sway bar in the 135i M Sport is actually 26.5mm which is exactly the same thickness as the E90/E92 M3 front sway bar. However, the 135i front sway bar has a kink in it in the middle and the E90/E92 M3 front sway does not.
I chose the E93 M3 front sway bar which is 28mm but unlike the E90/E92 it has a kink in it. I don't think there is much between the 2 sway bars but I didn't think there would be as many gains replacing the sway bar with a sway bar of the same size, although it is heavier and stronger - even though it is still hollow.