The splitter on its own is about £170 and comes unpainted so budget for that.
The quality and fitment however is spot on and well worth the money.
Fitting the splitter as with most 450 front splitters is easily done as it is all clips and plastic rivets.
The only tools required are Torx screwdrivers for removing the front panels to begin with.
Remove the front panels from the car following this guide
Although I am sure it is possible to fit this with the panel in place, I wouldn't try it.
Lay the front panel section face down on something soft to stop any damage occuring.