Rear tire width requirements in relation to HP?

Lustle said

I like that tread. Looks good. I wonder how they compare to radial t/a's. I like the radial t/a's and have ran them lots before. I just want something that's a good street tire. Can curve corners, launch decent at the stop light and look good cruising.

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My Dad runs Cooper Cobra Radial Gt's because they are 123 mph rated constant speed, have good hookup, u can still slide around a corner, and they are inexpensive (I paid 390 for all 4 from discount tire something or other on ebay)... and they look cool :-)