OBX Type-H Dual Muffler Axleback 04-08 Mazda 6 V6 (Ex. MazdaSpeed Model) 14 Gauge Mandrel Bent T304 Stainless Steel Catback Exhaust System Dyno Proven Performance To Increase Horsepower And Torque With Great Throttle Response 2.00" Pipe Diameter For Optimum Power Gain Backed By Manufacturer Limited Lifetime Warranty