I did some works on my such as replacing uca, LBJ, outer tie rods, steering wheel bushings, sway bay bushings recently. It made the car more sturdy to drive but I did not torque to spec like most of the CL members recommended. What happen to the ride quality if we don't torque to spec???

 

If it's not torqued enough, it could possibly come apart.

 

You should torque everything to spec. If things come loose, it'll whack out your alignment and possibly, as Parker mentioned, come apart.