Gen4 IWG and WG38/40/45/50L Spring Replacement KitGen4 IWG and WG38 40 45 50L Spring Replacement Kit The Gen4 IWG and WG38 40 45 50L Spring Replacement Kit is a genuine Turbosmart performance part designed for reliable operation, precise fitment and proven results on street and track builds. Why Buy from Torque Lab? Torque Lab supplies genuine performance parts for serious street and track builds across Europe. We focus on technically correct fitment, strong SEO friendly product support and proven