It's not clear to me when you mention sports seat. If you're talking about the standard or adaptive sports, they are very roomy. I have he adaptive in my '11 GT3 and combined with the overall ergonomics and sight lines, I'm very comfortable - even heel/toe angles are fine. If you're looking at shell style buckets (the kind with harness pass through), GT2 or otherwise, you'll really need to sit in them. At 6'3" and 265lbs, not my thing... You're a lot slimmer though.

 

I have Sport Buckets in my GTS and just remove the Velcro seat liners and fit great for track days. I'm 6'5 weight is 227-240 depends on the simple push of a button...LOL