I like the flame design and the way they came out on your Alabaster ... :-)
I was actually thinking of something similar for my Blaze but I am looking for more "ghosted" ones. I have seen a PT where you had to look twice to make them out from certain angles...and could see them clearly on another.

If I could add one little critique I would have placed the origin of the flames centered on the gilles of the Xfire to give the appearance they come from the engine bay