Maserati Quattroporte (M139) 2003-2012 - Muller 1-Way Series Coilovers Spring Upgrade:Swift Springs or HyperCo Substitute but will still notice a

but will still notice a great improvement

We now use a high-quality radial Koyo Japan bearing that integrates into the upper spring perch

You may occasionally experience spring noise with our new radial bearing mounts

Replacement Fortune Auto end links are available in various sizes depending on vehicle

Swift and HyperCo Springs are not available due to the design of the rear spring

Maserati Quattroporte (M139) 2003-2012 - Muller 1-Way Series Coilovers Spring Upgrade:Swift Springs or HyperCo Substitute but will still notice aCUSTOM. MODULAR. REBUILDABLE. In conjunction with Fortune Auto engineers and Muller Suspension specialists. All Muller Suspension systems are designed with maximum performance and ride quality in mind. Muller suspension systems are truly bespoke in utilizing industry lading machining methods and materials. Designed for High line Vehicles and Exotic Supercars. Amsoil Synthetic Shock Oil Flow Digressive Piston Technology Swift Springs standard on most