If you want it even stiffer you can change the standard drop links with the rubbers bushes in there for drop links using rose joints. I used that on my 4x4 sapph with a 21 mm arb from a Scorpio 24v. But it made it a bit too stiff in combination with the rest of the setup I had so I changed it for a 20 mm from a standard Scorpio. But I think the 21 mm will go back on in a while.