not even worth upgrading to cross-drilled or slotted rotors unless you're going for looks. they won't offer any performance advantage plus they cost way more than factory provided discs. want to improve braking performance, start with pads and fluid and once you pass their limit on the track move to a BBK
"I would quote everything pixelblue said, but you've already read it. Take it from someone who's put the 1 through its paces"