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Chevrolet Camaro Coupe and Convertible 323 hp (241kW) @ 6800 SAE Certified
Chevrolet Impala Police Vehicle 302 hp (225kW) @ 6800 SAE Certified
Chevrolet Impala 300 hp (224kW) @ 6500 SAE Certified
Probably exhaust, the manifolds are likely different and the air intakes/manifold might have more bends in the Impala.
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