993TT Headroom with helmet

[wini]

hi Guy's I'm doing a trackday soon but when I put a helmet on in my car it touches the roof,I tried ajusting the seat but I can only get 1.5" clearance fromn roof lining without helmet on.My car has electric sports seats and sunroof,I'm 6'2" Can you guy's point out my various options for gaining more headroom in my car,if possible I like to be able to be able to put the car back to standard for resale.