6'4" here, notice the only time I don't notice my head rubbing the headliner is if I am wearing a tight hat, otherwise I notice I am 'leaning' to the middle of the car somewhat when I drive.
2010 Camaro 2SS / LS3
-- Exterior: Black w/ IOM Stripes \\ Interior: IOM w/ Sunroof
-- RS Package / OEM Ground Effects / Volant Intake
-- Flowmaster AMT 3" Catback / Hurst Billet-Plus 2 Shifter