don't do the tip. but painting the muffler black looks good on the WS.
You can just get some hi-temp black paint from Pep Boys or Lowes. Lowes has some paint that will withstand 1200*F...I think that should be plenty. The kind they sell at Pep Boys has to be baked to cure...so I'd go with the Rustoleum they from Lowes.
Make sure to by some high grit sand paper (get the highest number you can find) to scuff the muffler up real good.