z28 really isnt much better. All the things that slp added are things that most people will swap out regardless for their own personal preferences. The ram air will not be noticeable til highway speeds and most people install cai anyways which is debatable on which is better. The exhaust also is usually swapped. Magnaflow is the most popular.

 

Well when you buy an ss you’re buying for the heritage and the prestige of owning a ss it’s not just a regular old z28 it’s a “ss”, and in reality the ram air really does nothing because the air bounces off the bumper and doesn’t hit it again till it reaches the windshield