Don't bother with the Z1 for heavy track use. They are too lightweight. The unsprung weight loss is nice, but the lack of mass is a significant obstacle to heat dissipation.
The Racing Brake 2 piece are the best option but $$$. DBA next best option and good value.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |