Looks like the wheels protrude beyond the sides of the body.Maybe okay at the front,but shreds the air near the sides nearest the tail.Not so good.
Cleaning up the rocker panel area and rear skirts would almost be a necessity if the Kamm extension were going to have a fighting chance to operate.And that's complicated given the sophisticated bodywork of the CR-Z.
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As far as the Kamm extension,here are some examples.And you can use the streamlining tool at the top of the forum page to help with the layout
