I'd say a full exhaust gives you more horsepower. I've been wrong before though.
Generally with a full exhaust the pipes are bigger and/or they bend, and/or collect in different areas and are better tuned to the engine. With these improvements you can not only see more horsepower, but what I like to refer to as "better" horsepower. Mostly I think your biggest gain with the full exhaust will be in torque. Let's not get me started on a torque vs horsepower debate.
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