[flipper35]

A sway bar will 'tighten' the end you put on in most cases. The Cobra with it's different fron and rear track can be a different story.

They will also let you run softer settings on your shocks and allow good roll control. So you can get a better ride and not degrade the handling. My car is very neutral without sway bars, but I could retain the minimal body roll I have now and have a more compliant ride. The trick is finding the right size for the front and rear to maintain the neutral attitude in the corners given the difference in the track and mounting points.

Clois' car for example will keep the inside rear tire in better contact with the track with the front sway bar on.

These are real basic explanations, I am sure there are others who can explain in depth and make better sense than I do. I need visuals to explain things.