Interesting tidbit from Motor Authority ordering the Z51 option decreases the top speed to 184 mph because the Z51 performance pack also includes a downforce-inducing aero package that improves handling but reduces the car’s aerodynamic efficiency at high speeds. Complete article at link below.
https://www.motorauthority.com/news/...-z51-is-slower
https://www.motorauthority.com/news/...-z51-is-slower
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