I've been thinking of buying an aftermarket diffuser for my Lancer but the cost and possible permanent damage to my bumper kind of puts me off. So I was thinking of adding some matt black vinyl to a small part of the bumper. Also, I'd have to remove the mudguards to install a diffuser.
I really want to add something black to the back of the car to give it a nice balance of b/w.
What do you all think? Is it too ricey?
Here are 2 different styles I've photoshopped on.

