I posted the headroom thread. I've had a 2,3, and 4. No issue with headroom in any of them including with a helmet. Gen5 the headroom for the street is a little annoying but not enough to prevent buying it, but a helmet is impossible for me, so that is a buying no go and the reason I've not picked one up. I'm 6'3" and 3/4 and 200 thin lbs. I also find the seat itself less comfortable than my prev gens, the arch in the seat isn't comfy to me, again it wouldn't keep me from buying it, but I've driven up to 11 hrs in a day in my gen4 without any issue, 1" lowering kit making it even nicer, but the gen5 is just too tight for me. I did find more headroom in the TA with base mechanical seats than in the GTSs I sat in.