Originally Posted by WutangRS
they are a touch better than the S1 version. its lighter for a start plus its all one piece compared to the three bit cast iron one of the S1. the arms are ball joint types compared to the rubber bushes so another small improvement of the S1. the roll bar is hollow and thicker than the solid one on the S1. apparently hollow ones are ment to be stronger.
not massive differences but worth the investment for all those track day slags
The S1 has sperical rose joints, not bushes mate.
The alloy has obvious advantages in weight. They stopped using it and went onto the S1 set up due to some legislation of crash testing IIRC...
Not sure about the ARB. I can't see a hollow tube having better torsional stress threshold over a solid bar. The tube will have a very good compression strength though.