im 5'10ish at 300 lbs its kinda tight, but manageable and the first gens have more room from what i was told and also the door panels are different between the 1st and 2nd gen. also you can do a foamoctamy were you remove foam padding from the seat to gain more room. people that are 6'3 have done this and dont have problems
interesting, i kinda want another mazda i have a 99 protege as a dd and i can honestly say it handles prety well for being stock figured it was a mazda thing haha