Who advertises them as reducing understeer? That's a new one to me.The typical bar between the strut towers and across the trunk aren't reducing understeer like they are advertised. I'm sure there is some measureable reduction in body flex (tiny) but whether some dude driving his car on a highway on ramp will ever be able to actually benefit/feel it is a highly suspect to me.
That's a pretty wild bar setup there.
In any case that's a photo of the track ready M3/M4.
Here's the prev-gen M3/M4 with the carbon fiber brace.
