yes, they all contribute to all around better handling, but they each do their own part. Start with lowering it, then get sway bars (rear, then front), start with rear bar, then front bar, you can get front lower and rear lower bars if you want but they don't do too much in the equation. Sway bars and lowering will be most beneficial in cornering, strut/tower bars will give you a better feel/responsiveness by addding rigidity to the frame.