I noticed in mine, actually most of the cars I sat in, I reclined too far back and my head was not centered in the bubble. The two things I did was install the spacer on the engine wall Olthoff sells, you can do the same by using towels or something to sit a little more vertical, and I also had the floor shaped a little and the seat shaved some to increase the head room. I'm 6'1" and fit fine with my helmet.