Baer talks about the benefits of a crossdrilled and/or slotted rotors on their site. They say as far as a street driven vehicle (with no plans to seriously auto-x or anything) the benefits are purely cosmetic. You don't generate enough heat and what not to benefit from the gas release of these rotors. Larger rotors with a bigger diameter and/or width would help, but again it wouldn't matter if they were smooth or drilled/slotted. I say if you don't want to buy a complete system or anything, just go and get some good pads and good fluid and you will notice a significant difference.