Rear evo diffuser installation on a lancer es. help.
 

I hate to pay a service department to install it for me for 200 dollars so i was going to do it as a little home project. Is it pretty complicated? do i need to line it up and drill or what? oh and do i need to take the stock bumper off and install it or is it just an addition to the stock? if i cant get an evo might as well make it look like one:) help? thanks guys