Thanks for the comments. I'm perplexed too: maybe it's the expectation
that there wouldn't be any cowl shake after all the hype. And, seems
worse with the top up than down, unlike other cars I've had. "Course,
although the suspension is stil mild, it's probably tighter than the V6.

Yes, my past cars had tower-to-cowl braces: doesn't look like a
bolt-in is possible with this body. I see braces from $60 to
$200......guess it won't hurt to put one on - and I'll have something to
lean on when detailing the engine!

BTW.......used to have one of those Continental 4 door
converts......beautiful car. Sort of scary when you put the top down
and opened all the doors and saw how little structure there was to it.
But never a shake, wiggle or rattle. But it weighed 5500 pounds!