6'5 here. I found that placing the seat in just the right spot gave me enough room. The only problem i had was at the track with a helmet on i simply did not fit unless i hunched over. Being 6'5 and liking small sporty cars its just the price you pay i gues. I did have to remove the knee bolster with the seat in the spot i liked. That gives you alot 2inches more of knee room.

Waldig gave himself another couple inches of head room lowering the seat to the floor.