Quote:
Originally Posted by patrickt
For predominantly street-driven cars, there's a point between your two numbers where "making more" really doesn't accomplish anything. There was a point when I was driving on my hard-as-rocks and old-as-Methuselah Yokahama tires and they were breaking loose just coming off of stop lights with moderately light acceleration. It's really hard to put a true 500+ HP to the ground, without spinning, on the street, and still be driving under a 100MPH. 
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I agree with all of that (because that has been my experience), without traction control, launch control, 20" rims with better tires, seems like 400-450 is the max that can be handled with a decent/good 15" tire. If possible, better to focus on weight reduction than adding HP.