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Originally Posted by John V
I know I've mentioned this before, but both the H&R and Eibach bars are SOLID! They are both WAY stiffer than the GT3 bar. And in my opinion, way too stiff for a Boxster.
The GT3 and M030 bars are just like stock - hollow - but stiffer.
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the Eibach is actually a 24mm hollow bar. i called them before i decided on the GT3 bar to get a wall thickness; i calculated it to be roughly the same effective stiffness of the M030 'S' bar.
the H&R's are indeed solid. the rear is about 25% stiffer than the M030 'Base' bar on its softest setting. the H&R front is torsionally stiffer than the GT3 bar on its softest setting, but it has a longer lever arm. it is therefore just a TAD stiffer than the GT3 bar on full soft.
the GT3 front bar on the box is a bit stiff for the road, but GREAT for performance. the H&R rear is actually tolerable on the road at full soft. it's a bit aggressive at full stiff.
for giggles, i set the GT3 bar and H&R rear to full stiff for a day. WOW. WAY too stiff for town (and anything other than an oval track for that matter).