This is a new one on me, convertible???

chryslerfat said

Imagine how much horsepower you would need to move that with the top off. That rear glass is going to act like a parachute.

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I am not sure if there is much air moving along the roof line. Most of the turbulence happens at the decklid and package tray area... thus the Charger/Daytona rear window plug.
Targas are really nice to drive precicely because of that. Very calm at speed .