aftermarket suspension = noise?

Modshack

I've modded a ton of car suspensions and never gotten more noise (clunking type anyway) . There's no reason to expect it really if the install done is carefully and correctly.

I think you have some sort of install error. Swaybar clunking is typically at the pick up points. Not tightened enough and they are moving in the holes. Make sure you use a wrench on the back side and the front side of the joint so it is tightened securely to the bar. This is the most common reason I've seen for noise, particularly after a sway bar install.

On the handling, you need an alignment. You most likely dropped the car and now a lot of your settings are off..Bad toe in the rear will cause the instability you seem to have. Depending on how radical the drop, you may need aftermarket parts to get it back in line..

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