For Nissan 350Z/Infiniti G35 Dual 4.5" Rolled Muffler Tip Hi-Power Catback Exhaust System Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability TIG Welded CNC Machine Flange for Resistance Against Pressure and Corrosion Aggressive Deep and Smooth Tone Sound Dyno Proven to Instantly Increase 15 - 25 Horsepower or Low End Torque Dual 4.5" Diameter Muffler Rolled Tip / 2.25" Inlet