Those of you who are posting nonsense are morons. If you can't answer his question or at least steer him in the right direction, leave this board. Revmaynard, I thought better of you until this nonsense.

Anyways, AWD Sentras have been done before. But just like you were told in the other thread you asked in, it would require some cutting and welding to fit the driveshaft and rear differential. You'd probably have to use a fuel cell as well since the rear differential would probably be occupying the space previously taken by the gas tank. Yes, it can be done, but I don't think its worth the trouble. It would cost a large sum of money to pay a shop to do it, and would have a hefty learning curve should you try to do it yourself. There are many more ways to improve a Sentra and leave it FWD - the B13 chassis is plenty competent enough when it comes to motorsports. So why bother? If the fact that its FWD bothers you, sell it and buy another car.

If you are really considering doing this though, I would suggest finding a Sentra or Nissan forum and contacting one of the people who have done it before. That would be much more helpful than posting here, as you can see how well that turned out.