Hello guys and gals. How much better is the 2.1 version over the 2.0??? Is it really worth spending the extra $125 or so to upgrade to it??? Will I (poor driving skills club racer) benefit or even notice the upgrade??? It mainly upgrades the rear end even more and puts 14 degree angle caster things (I don't know what they're called) plus 2.3mm front sway bar up front. Any feedback would be great. Thanks