sway bars on a 92 civic sedan

Yup, they're practically the best suspension mod you can get. As for which to get and what size, it depends. Do you already have a front anti-sway bar? If so, you can get a rear one only to help remove understeer. But if you only have a rear one and no front one, your car can get very twitchy and unpredictable. Also, running a thick anti-sway bar up front and a not-so-thick one in the rear will promote heavy understeer. However, running a fatty one out back that's thicker than the front can promote understeer. So you might think to buy equal sized sway bars, right? Well, that could promote neutral handling on the verge of understeer or oversteer. It really depends on how you car handles now. I'm running my Civic's stock front anti-sway bar with a 22 mm Progress anti-sway bar in the rear, and it handles a lot better. It has gotten twitchy a few times, but for daily driving, it handles great. I'd probably change my Konis' settings for hardcore driving (harder in front than rear, so I understeer quite a bit), but it feels great on the street.