Mean machine? Have a look at the artwork on the 2008 Copperstate Winner.Carl Brownd of Centennial, Colo:
His RV-6 intake has something extra inside. Next best thing to a Flying Tiger . “It’s actually an air diverter and I got some decals and did it up.” said Brownd.
I’ve visited the Lycoming plant in Williamsport, PA and I hadn’t seen any of these lurking in the weeds but I did see the IO-540 being built.
Might be related to the Gremlin that sometimes hitches a ride in my plane.