PLM Air Filter Kit - Velocity StackPLM 3" Composite Velocity Stack & Filter Kit Includes: Air filter Velocity stack Silicone hose 3 x hose clamps Key Features: Hose connection size is 3" (76mm) or 3. 5" (89mm) Velocity Stack opening is approx. 6" (152mm) Measurements in OD. Universal Application. Attach to your air box, intake pipe, turbo, and many others. Velocity Stack is proven to work! Fits Many Honda & Acura car models, as well as others! Velocity stacks are also called intake