I wanna get slightly sidetracked here but I wanna get into the subject of front spoilers a little as some have mentioned they mustn't be left black unless the lower valance is black....
That is as always a matter of what the car itself looks like.
While I would agree that on a car with argent accents and lover valance a black spoiler would look out of place, I still think that depending on the overall look on the car a black spoiler can look pretty good.
One must not forget that the generic Mach1 has a clearly defined color scheme (or two, when we thing stripes/no stripes) that we are used to which is why, as soon as you step away from that, it looks weird.
But as soon as you start doing your own thing it can work either way, depending on how you combine it all.
I'll have to bore you with pictures of mine to illustrate my idea but those are the pics I have to work with. (BTW, if someone thinks it doesn't look right and does not agree with me, they may speak up. I don't mind criticism at all and I like to learn other peoples' opinions. Don't be shy! I mean it.)
When I had my car done I wanted the front spoiler to be yellow like the rest of the car, as I did not want it to look like an add on but more like it was part of the package in the first place.
Here's what it looked like:
While not looking all that hideous it still looks wrong.
Now, same setup, same grille, same everything, only with the spoiler painted black:
I think it works, even without the black lower valance. The spoiler is much less pronounced and still doesn't look like an add on because of the all yellow/black scheme of the car. It's simply another black accent.
(Actually, after looking at these pictures side by side, I think the yellow one looks even more like an add on than the black one. It's like it's trying too hard to fit in. )
Now, if my car was all yellow with a white top and full chrome wheels, I do think the black spoiler might look alien on it.
So I guess there are no rules what works and what doesn't. It's a matter of what style the car has and if your spoiler (or anythings else, for that matter) goes with it or breaks it.