Tom's X'dynamic Racing Spring - made in Japan Designed and engineered by Tom's Racing in Japan.   With the accumulated years of experience in many racing events, these springs systems were developed to the best quality standard.  Every spring models had been precisely tuned to the maximum performance by physically tested for precision - ride height and spring rated. And tested for handling performance by our racing teams on race tracks over and over. X'dynamic series Racing Springs - Improve handling, better aerodynamics and gives an outrageous look. Increased spring rates - sport tune your suspension and minimize body roll.  Each spring is tuned for that elusive combination of handling and control, yet a comfortable ride.  (These springs rate about 25-30% stiffer than stock). Made with highest quality materials, manufactured precisely to our standards.  These springs are precision-wound with the highest quality Japan spring steel available.  It's heat-tested twice, to realign the molecular structure for long-term resilience. stress-relieved, pre-set, and shot-peened for maximum precision and durability.  Inspected to our exacting specifications and polyurethane-epoxy powder-coated with our winning team color:  Red. Lifetime Warranty assures enthusiasts of our exceptional quality products. Click Here for Tom's X'dynamic Racing Springs