When your talking basic bolt on's an engine is a basic air pump. The reason you shouldn't start with headers is because generally the catback on cars is restrictive. So if you replace headers your still going to be bottle necked by the catback. Its like a hose, regardless how big free flowing the end is if the front is kinked your only going to flow so much. Since you have a nismo from a power standpoint replacing the catback is a waste of money (unless you want a different tone). So for you it might make sense to start with headers, high flow cats, or intake.
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