While I agree, it is a no duh moment, but it does ask a very good question, that we at NASIOC often throw up. Is it the car that is good, or the tires. THe 2002 WRX was crippled with terrible All Season tires, that did not put up good magazine numbers. THe tire can make the car. Many of the GM cars of past (turbo cobalt SS to name one) got amazing lap times primarily due to its OEM tires.
This also goes on to point out that tires are the single biggest thing you can do to transform your cars performance.