It may look cool.
In this picture, I think it looks too busy because of Tail-lights and spoiler but taking those out of the equation might look good..
Consider using same mesh for lower, sides and even front bumper or wherever you have mesh so it looks consistant and "ties" together. Make sense?
Keep in mind, GT3 Style bumper may be more appealing to Porsche lovers because its more "familiar" but maybe you can teach us something.
