There's a textfile that covers the modification Mark talks about for Profighter Q... read it here. Your Profighter most likely already has a NTSC chip installed, so it doesn't work with your PAL SNESs, even with Cart inserted. It'd be much cheaper though if you'd just open your SNES and perform Mark's "cut pin 4 of the lockout chip" modification (more herehere or here). I also have a Profighter Q and it works perfectly with it (don't have the chip installed and don't need to have a PAL Cart inserted).
-- Matthias