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Borla Cat-Back exhausts feature patented straight-through technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy and the distinctive Borla Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium Aircraft-Quality T-304 Stainless Steel, an alloy superior to T-400 series knock offs, to give you the absolute best in performance and durability. Ultra smooth mandrel bends ensure maximum flow and power, and precision computer controlled CNC manufacturing. Best of all, Borla stands behind every system with a Million-Mile Warranty.