the aviator pump flows more. not sure on the exact number. but i think it requires a little rewiring. if you are looking for a new pump, get a single Ford GT pump. it can support 500-600rwhp with a single pump and only costs about $100.
^BIG +1...
$90 through Randy, and iv heard of someone maxing the pump @ 550RWHP on a GT mustang, with nothing more than a little thicker gauge wiring to the pump (which isnt required). Stock fuel lines and rails, with 60# injectors.