H&R Front Only Anti Roll Bar Kit - FR:21mm - Arosa
I have this ARB installed at the same time as the Whiteline ARB.
I have so far only used it on the street. I have heard some people complaining about understeer coming with the stiffer front.I have not experienced that on "inspired" street driving. I think it makes the car, together with the Whiteline, go a lot quicker around the corners and roundabouts.
I have no experience from track driving with this upgrade yet though.
You might need to change some "rubber mounts" at the same time (I did).