Jane, good advice for track only applications. Just remember that the best track solutions sometimes do not work well on the street, no matter how hard you think you drive. As Jane can tell you, even aggressive street driving does not stress some systems, like the brakes, nearly as much as a few laps on the track.

For street/track use, the R4 Porterfields will generate a lot of dust, and a lot of that will be from the rotor! If you don't get them up to temperature, they don't work too well, and they are harder on the rotors. Use the R4-S to get the best street/occassional track day performance, or try the EBC Red Stuff for street/track or Yellow Stuff for track only.

I use the ATE Super Blue racing brake fluid, along with their similar gold color fluid (you alternate which you use when changing fluid in the whole system so the color lets you see when you've purged the old fluid), just a personal preference.

Be careful grinding down the calipers -- hate to weaken the caliper, especially if it's at a spot that the fluid travels under pressure -- a blowout wouldn't be fun! I've had that happen in the old days when there was a small piece of hard brake line as a "bridge" between the two sides of the caliper and it got damaged..........

While I don't like to use them unless I have to, spacers are available that are hubcenric, and do not cause vibration or out-of-round issues, you just have to be careful... I find the IchibaUSA ones to be the best.