I meant JUST
half the 2 inch hole, as in not
a complete circular hole.
Our ROAR rules state the hole in the windshield can be no larger than 50mm, measured at the widest part. We can cut the entire rear window out if desired. But the cars I've seen at our Nationals didn't have the whole hole...
They do have a giant hole in the roof to allow the fast fuelers (guns)access, too.