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The differences between the Competition header (top) and the Super Comp header (bottom) are readily apparent. Not only are the primary tubes bigger, but the Super Comp header has different length primary tubes, is a bit lighter in construction, and has a collector tuned for optimum horsepower. It's also a bit more expensive. We went with the Competition headers because the smaller primary tube and its design would promote more bottom end torque than the Super Comp headers, which is what this 3,400 pound Nova would need.