aftermarket suspension = noise?

import111

The more you mod the more noise you get. Has happened with every car I have owned. Larger swaybars especially make more noise I have noticed with my last car.

Yea, you might have too much negative camber. Get that fixed. Also though, the stiffer you make a car, the line between grip and slip gets smaller and smaller. Ultimate grip may go up along with responsiveness, but the breakaway point happens more sudden.

Not sure if your swaybars are adjustable, but if they are you might try to put the rear on it's lower setting and see if that helps reduce oversteer. I also run BC coilovers on my Z and I keep the rear about 5 clicks softer than the front to help with that.

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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