will it work?

[boatinjoe]

If I get one of these stillettos, can I use my futaba fasst 2.4 and pull the spektrum reciever out and replace it with a 603 fs

[simo71]

Yes you can do that, the only ESC that I know of that is a bit fidly with other radios is the UL-1 which of course is not related to the Proboat one.