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Wow, if Greddy is using Rotora and charging that much more.... well.. that sucks!
You pay for the name.
If you want these calipers (in the same 2 colors that GREX offers) you can get the JBT brake kit from EVO-R, which ultizes the exact same calipers as the GREX and Rotora 6-piston kits.
I get a whopping $153 more for the Greddy versus Rotora on Intensepower.com and that's with a 355mm rotor from Greddy and 335mm from Rotora for the front brake package.