If you don't have a bar on now, ie OEM GSR bar, then I would suggest you get one.

I had a stock GS suspension (except I changed the tires to 205/50/15 Dunlop SP5000's), and I didn't have any bar on before. After I installed the Neuspeed bar, I noticed a difference in steering response...it felt sharper and the front end felt more controlled. Overall, I would buy the bar again if I had the choice.

I paid about $96 for the bar shipped.

Here is the pic of my car with the polished Neuspeed bar...