Execution: POLISHED STAINLESS STEEL Manufacturer: TurboWorks. Entrance diameter: 3 '' 2-YEAR WARRANTY! All dimensions are shown in the drawing. The product is not road approved. It is intended for use in motor sports, tuning exhibitions and others.Manufacture: POLISHED STAINLESS STEEL Manufacturer: TurboWorks. Input diameter: 3 '' 2-YEAR WARRANTY! All dimensions are shown in the drawing.