For Nissan 370Z Hi-Power 4.5" Burnt Tip Muffler Catback Exhaust System Dyno Proven to Instantly Increases 15 -25 Horsepower/ Low End Torque TIG Welded CNC Machine Flange for Resistance against Pressure and Corrosion Aggressive Deep Sound while Ensures Smooth Exhaust Gas Flow Increase Engine Output and Efficiency Inlet/ Muffler Exhaust Tips: 2.25"/ 4.50" (Slanted and Burnt) / Major Piping Diameter: 2.25" / Gaskets and Hardware Included