Let's see:
1. Overall build quality/quality control
2. Caliper material selection/forming - cast, squeeze cast, forged, mono block
3. Multi piston designs
4. Swept area of pad/rotor - friction available
5. Design of the rotor - heat dissipation, cracking, warping, metallurgy
6. Units produced. You can spread out a lot of overhead on a large run of cheap parts.
I think you will find that modulation of the pedal will have a better feel and the pads and rotors will last a bit longer with the upgraded kits.
For the short haul of a few laps at a DE, depending on skill level, you may never see the benefit.
Not to sound like a broken record but installing Motul RBF 600 along with a good set of pads for the track may suit your needs just fine.
I'm heading for Mid-Ohio this Friday with the sports package, Carbotech XP10/XP8 F/R and a fresh flush with Motul RBF 600.
I think the lack of oil cooling will shut me down WAY before a braking issue.
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16 Cayman GT4, Carmine Red, Buckets, PCCB etc.
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