Manufactured From High Quality Aircraft Alloy Steel 20% - 30% Increase In Spring Rate Over Stock Bars Helps Improve Vehicle Handling On The Street Provides A More Consistent Spring Rate For Better Vehicle Control Performance Products' tubular torsion bars are offered in a wide variety of lengths and diameters to allow selection of the right spring rate for Porsche® applications. These torsion bars are manufactured to extremely tight tolerances and exacting heat treat conditions – the result being torsion bars with a more accurate spring rate and greater durability. The torsion bars come powder coated metallic red for a beautiful finish and long lasting durability. All Performance Products Torsion Bars are guaranteed for 3 years against breakage. NOTE: Worn torsion bar bushings will shorten the life of torsion bars. Our 3-year guarantee will remain valid only when bushings are in good condition at time of installing new Torsion Bars. Learn More