But what about when you have higher power? I'm planning on having 2 S13s, one with a ka (or ka-T probably) and one with an SR. I'd like the SR to push about 300-350 and I'll have 2 coilovers to switch from, Tien HE and another set for circuit driving. I know with the 350/Tein HE setup, I'd need more contact patch in order to keep me alive. So would your theory of "smaller tires" still hold true in this case???

PS-not flamming here, just researching. I THINK I've pretty much planned out my setup, and I THINK I know what I'm up against...only problem is the $$$ flow.