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Why doesn GM advertise horsepower, torque, and fuel economy increases like most other exhaust manufactures?

April 26, 2017advertise economy exhaust FUEL GM HORSEPOWER increases manufactures torque

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Why doesn GM advertise horsepower, torque, and fuel economy increases like most other exhaust manufactures?

1 Answer

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A. The results of horsepower, torque, and fuel economy are very subjective. Changing the cat-back exhaust system alone will generally provide only modest gains.