If you're serious about tracking, you might want to get something bigger in terms of braking. GSX is what I consider "spirited street" braking setup. GSX brakes last about 10 hours on a 300hp car before the seals melt. You should really look into Stoptech or Wilwood big brakes.

Also, the ES/Prothane full urethane bushing replacement is a cheap but SUPER time and labor consuming upgrade that makes a really big difference.