WAT RACING  special design the 57mm big tube coilover, with the 50mm big piston. The bigger piston support the user whom needs heavy steering such as Off Road Coilovers, drag racing suspension,  the big tube coilover have more damping oil to protect the over heat problem, and support more rigidity at the corner. WAT have F.I.A  A Class dirver  and Coach to test the product quality and disngn the product. We can custom the damper for every customer.