Hi Fuzzy,
I’m 6′ 1″ and I run without an extended porch in TaG Master. I’ve driven Birel, CRG, GP, and Shockwave karts and haven’t felt the need for an extended porch in any of those. Usually there’s enough adjustment in the pedals and the steering to let me be comfortable. I live in Erie and you’re welcome to try my kart on for size if you want.
Charles