In Reply to: Brake ?'s: Euro vs cross/slotted, SS lines, (more) posted by ///MD - going fast, need to stop! on June 20, 2000 at 22:32:22:
SS lines basically just help take away some of the mush in the brake pedal. Personally, I can't say it makes much of difference over stock lines as the stock lines appear to be pretty good and also after a lot of braking at my last track event I cooked my brakes (using stock pads).
I've been told that the best upgrade is pads. Try that first and then make other changes if that does not do what you want. I've switched to Porterfield R4S pads (I tried R4 Race pads but the squealed like a freight train!).
I've also been told that drilled/slotted rotors aren't all that great of an upgrade. You have to watch out for crackes in drilled rotors. Both increase surface area for cooling (which is the main thing you need for the M3 brakes) and they are supposed to vent gasses generated by hot pads. However, I've been told that current pads don't generate much in the way of gasses.
I've upgraded my front rotors to Euro rotors to see if they stay cooler. They should. Won't know until end of July when we have our next track day.
So, first try better pads. It's a cheap start. Then try the Euro rotors. I know several guys that says this is an excellent setup. Next, try ducting.
If all that is not enough for you, then get the big brake kit (Porsche TT brakes).