As above. Not even worth considering.
Change your rims to different offset if you want a wider stance, but don't use spacers.
Even if you are the victim in an accident, you might find some large obstacles placed in your path because of the unroadworthiness of the vehicle.
Same goes for extended shackles etc. Don't think that just because the spacers are hidden behind the wheel's face they won't be seen or worried about - while it's true on the initial inspection, once the assessors start pulling their "fine tooth comb" out they'll spot it. Let's just say that I've seen actual evidence in support of this and leave it at that.