[JoeC]

I think Chevy put it on the books to make it legal for Trans Am racing along with the 2x4 Cross Ram, 4 wheel disks, headers. cowl induction, etc. but Mark Donohue's testing showed that it was better without it. Mark talked about it in his book "the unfair advantage". I was wondering if Chevy put it on any Z/28's from the factory.