Material: POLISHED STAINLESS STEEL Manufacturer: TurboWorks. Entrance diameter: 2.5 '' 2-YEAR WARRANTY! All dimensions are shown in the drawing. The product does not have road approval. It is intended for use in motor sports, tuning exhibitions and others.Manufacture: POLISHED STAINLESS STEEL Manufacturer: TurboWorks. Input diameter: 2.25 '' The muffler has a permanently built-in adjustable silencer. 2-YEAR WARRANTY!