If you are doing the brakes yourself, take the rotors to Autozone, O'Reillys, etc etc. Most of these places turn rotors for $10 or less each. You might not even be able to see or feel warped rotors and the small grooves in them might seem insignificant, but they will lessen performance of those killer pads. This will also help seat the pads better and reduce squeal and give longer life to the pads. Remember be gentle on the brakes for a couple of weeks. I actually applied my stillen pads/factory rotors slowly on the interstate and slowed down from 80-60mph. Then let them cool a mile or two then did this process again and again. I avoided heavy braking applications on the streets for a while. In over a year and a half(25K) I do not have any brake squeal. I hope this helps make up your mind.

DeanoD
1997RS-NeverTurbo
http://ar.dsm.org