is it possible to remove the splitter without jacking the car up?

Yes, just grab it with a set of pliers/mole grips and yank it off.
Getting the new one in is a bit trickier, but put one side up on a tall kerb to allow room to get under if you really cant be arsed to jack it up.
 
Yes, just grab it with a set of pliers/mole grips and yank it off.
Getting the new one in is a bit trickier, but put one side up on a tall kerb to allow room to get under if you really cant be arsed to jack it up.

:cartman: thats what i planned on doing, putting up on a high curb. thanks for your help :)