...sink? OR can I re-route the drain to enter from the side?
My bathroom sink is located in a corner with the back to an outside wall. The builders installed the the drain pipe to come up through an interior wall to the right hand side and turn the corner 90 degrees to get into the outside wall so that the drain could approach the sink from the back. This sink clogs constantly due to all the angles - I have to remove the trap and clean the pipe in the wall every four months and the smell from the pipe clog is horrible, like straight sewer gas. I would like to know that if I tear off the drywall and route the drain to come from the interior wall straight to the drain, to remove the 90 degree turn in the outside wall, if it would still meet code?

http://img406.imageshack.us/img406/464/sinkrf2.jpg
In the picture the Pink represents the CURRENT drain and the white tape represents what I want to do.
the house was built in 1979 and I don't know what they were thinking when they did this.

You can move the trap arm to the right and that's fine - which reduces (I hope) the number of turns before it reaches a vent pipe (a pipe that brings air to the system and most likely heads to the roof of the house).

What annoys me is the double (white plastic) compression fittings that you have of one into another. You might want to change/extend the silver chrome pipe first.

Some local code only allows 180 turn before reaching the vent pipe, so you might want to check on that. Also you want to have a 1/50 slope, that is 1/4 inch down per feet.

Hope this helps although too late as you posted in sept 2007.