Well in my stuck in the '60's way of thinking, I would only use the alternatives strictly FOR drag racing or autocross/road racing. Stiffer bushings with less deflection are tailor-made FOR drag racing. I have run polyurethane on a purely street driven car a couple times and have eventually experienced noise issues, even with using the manufacturers lubricant. ANNOYING on the street ! Sway bar bushings would be the only exception for me. Just my old *** '60:s opinion.