I don't know if powdercoated tips will work. I had a set of "black chrome" tips installed, which were chrome that had been overpainted with a tint to darken the chrome. The heat generated by the exhaust actually burned off the tint. The question is, how high a temperature can the powdercoating material withstand?
IMO, the way those would look ok, is if you dump them out the side, behind the tire at a down angle and tucked in, so you dont see the connection...If you notice those are only 2"ID..what size tailpipe are you using?