Different proportion from his tires to yours, but same theory. Check out the video at 19.15 on.
Alters sidewall angle. Most of the guys using wide wheels with 275s have LOTS of power, and the trick is power management, and avoiding tire shake.
His 20"wide rims are wider than the tread on a funny car 17/33x16
A good friend of mine has 275s on 10" rims, cause he couldn't fit any wider rim on his malibu. He has 1200 crank horsepower.