Some extreme stretches are stupid, there's no point and people do it just to look cool. I do like a little bit of a stretch, like the 235 on a 9.5, for drifting. It increases the cornering stiffness of the tires by essentially preloading the sidewall in the lateral direction. So compared to something like a 275 on a 9.5 where the sidewall is sloppy and quick direction changes don't give good steering feel.
For road racing, I do like a little more tire under the car that's why I have another set of wheels and tires. The setup I posted here was just for drifting and driving to the track. Although I did track the car with a 225/235 setup on 9/10 wheels at pocono. And the brakes were the biggest limiting factor, so I couldn't carry as much speed through turns as I would've like because of the slightly unsettling lack of brakes. But despite that, I did not feel that the tires were holding me back.
But I do have another setup that I haven't fit to the car. It's 275/315 Hoosiers on 10.5/11.5 BBS Race wheels. I still don't know how it's going to fit on the car, but that's what the winter is for.
But I do have when people try and put too much tire on a wheel. It works for straight line, but it doesn't work too well for cornering.
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