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Gibson Performance Exhaust Systems are dyno tested and are guaranteed to deliver up to 15 horsepower gains and 30 Ft/lbs of increased torque. A Limited Lifetime Warranty from Gibson backs all Diesel Extreme Dual Exhaust Systems. Improve your Ford’s horsepower and torque by installing the right Extreme Dual Exhaust System. Gibson Diesel Extreme Dual Exhaust Systems for Ford are available in aluminized and stainless steel mandrel-bent tubing. This tubing maintains consistent exhaust flow through the bend for outstanding performance. They also come with a fully welded, baffled and chambered Superflow TM Muffler, not packed or screen, so nothing to blow out.