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i think its not so much that there is no room for improvemnt on the Z's but that its all done to the point where any gains are so minimal that ist not cost effective. Like the header deal, 4 to 5 hundred bucks (ebay headers) and maybe 5 to 7 extra hp mayyyyyyybe! intake (AFE) i probably lost HP (but according to them gains of 5) but it does sound cool! Exaust is mostly a sound preference for most people wanting it louder or deeper type of deal. HP gains?? nah, maybe 1? and not to mention theres hardly any room for better pipes down there. Most all bends that the car has are bent there to avoid another component. Any straighter pipes would involve moding the car to big extents. and RPI scoop gives you better MPG +2 or 3 depending on how you drive.
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