I am going to be tiling over tile in a shower. How can I lengthen the shower drain pipe? Is there an extendor pipe available?

I am going to be tiling over tile in a shower. How can I lengthen the shower drain pipe?? Is ther an extendor pipe available??
Unless you want to tear up the existing tile and extend the raiser I would slope the new tile to the drain and terminate it with beveled tile. If you wish to cut out the drain and replace it you may have some luck using a Plumb-Rite replacement drain. Click on;
http://www.plumbrite.com/ to check it out. Good luck, Tom