Anybody tried the 370 mm rotor upgrade?

[serpent]

[INDENT]Rear balanced kit: http://www.racingbrake.com/RB-Rear-A...dge-p/2546.htm

This front BBK + rear RB balance kit (RB recommendation for tracking combo- fits 18' Wheels): http://www.racingbrake.com/ProductDe...ode=DOD-IRP-03

Will the 6 piston with 370mm rotors fit in the stock 18" setup? To be specific on which OEM 18", considering the Sidewinder II.