Shocks: looking for Blistein quality at KYB price.

Once you understand the way that KYB Gas-A-Just shocks are constructed, you understand why they are inferior.
Most non adjustable shock absorbers are either linear or progressive in their operation. This means that during operation, they have either equal rates of dampening from extension to compression or they get firmer from extension to compression. Bilstein shocks are progressive. As the suspension compresses, the shocks get firmer.
KYBs are actually the opposite. They are digressive, which means that they are initially harsh but as the suspension compresses, they soften up. This only works on soft suspensions on smooth roads. If you have slant six torsion bars, the KYBs might make the car feel firmer but if the road is rough, the car will not ride well.