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DynoMax Ultra Flo Performance Exhaust Systems are made from stainless steel materials for that proven durability. DynoMax's Ultra Flo Muffler technology delivers a deep custom exhaust tone that will announce your arrival as you cruise through the highways. The muffler of each DynoMax kit utilizes an exclusive CRF technology that absorbs the resonance which results in a deep performance exhaust sound. Each DynoMax Exhaust System is backed by a Limited Lifetime Warranty and is also covered by a 90-Day Performance Guarantee. DynoMax Ultra Flo Exhaust System offers instant performance benefits, premium look and excellent workmanship, giving you excellent value for an affordable price.