Quote Originally Posted by speedminded
some rotational inertia physics bullshit...those wheels prolly weigh 60+lbs each equaling alot more weight and resulting in power loss.
Its unsprung weight also, so it ends up "feeling" like A LOT more then just your wheel and tire weight x 4.

I agree with everyone else, not the greatest choice for a mustang IMO, but its your car so do what you like.