Introducing the STR Airmaxx Pro Drag Manifold. been dyno tested and track proven to increase the flow of intake air into your engine. The easier your car can breath, the easier it can make power. STR flushed mount the velocity stacks and tapered runners to a specially designed plenum. STR CNC cut a flange that mounts to your motor perfectly. These manifolds are dyno tested and tuned to provide the greatest amount of air, peak horsepower and maximum torque. STR manifolds are a direct bolt on, and allow all stock sensors to be attached. These manifolds are a must for the serious racing enthusiast.