I've seen some pictures of the matte black FJ40 with the 2JZ-GTE. Nice looking car. It must be very quick, too. This, though, isn't an FJ40 any longer (other than its frame and bumpers, of course). So whether or not it's "been done" before becomes a bit of a moot point, I think.
Sorry...but no; the pipes are staying, since I happen to like them quite a lot. And so is the grille. I may be re-arranging the grille somewhat, but the basic shape is going to stay the same.