Whats the max for B18B kit?

WIthout upgrades, out of the box, power/boost for JRSC vs Greddy. Is there a way to turn up the boost on the greddy turbo? If so, is it more or less efficient than upgrading the pullys on the JRSC?

Is greddy the only turbo kit that'll let you keep ur AC? (98 RS)