| First let me say thank you for your diligence. I for one sincerely appreciate the effort you put into the new rear bumper. Now for my input... If the center portion of the bumper (the area between the exhaust pipes) was a little lower (even with the sides of the bumper) it would give the bumper a sleeker look as seen in the initial concept photoshoped version. Also I noticed the initial concept bumper was completely smooth (no lines) where as this bumper has a line going through it similar to the OEM bumper - perhaps omitting the line would give the Z a better look. 

Here is a picture of the bumper without the line. You can also see how much higher the center is compared to the sides. 
Once again in the initial photoshoped version the center and sides line up. 
Also notice how the sides curve in better on the initial photoshoped version - it flows with the body. 

Other than that - the side view looks great! 
Here is what it would look like without the line:

I hope this helps - A R T I E
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