I would say it probably won't do much for you then. I do have it though. I put both front/rear cusco strut bars on and the lower bar on at the same time and it made my car understeer a little bit more than before, I don't know what caused it though because I put all 3 pieces on at the same time. I also have DMS 40's and whiteline front rear anti-roll bars and will install my front control arms as soon as I get off my butt and do it.
But my car doesn't rattle/squeek as much anymore with the strut bars and lower bar.
So I guess it's not totally nessisary unless you plan on replacing your suspension and doing some autoxes or open track days.
I've got the Cusco Lower Arm Bar (Version 2) and LOVE it. Also have both Cusco strut bars and Cusco sway bars. The stearing alone seems to be more accurate now with the 'LAB' installed. Turning the wheel feel much less sloppy. Also noticed that the car doesn't "float" while turning like it did while in stock form.
Very easy to install however, the bolts are extremely tight and difficult to loosen.