I used a cut off wheel. cuts through the plastic fine and then through the metal. It took me about a hour to do mine. I still have some small things to clean up but thats about it.I'm going to use a Dremel with a cut off wheel. Then a little file work is all that will be needed.
Just make sure you cut it from the tire side towards the rear. One slip of the blade would definitely cost you your tire.I used a sawsall and a file. Took about 2 minutes. Best mod i've done yet. Back of the bike looks 100 times better.