When you do the GTiR swap from a Ga16de...what do you do with the AWD tranny? Can you convert the car to AWD. I don't have Sentra yet, should I just look into getting SE-R to start with. I'm looking at the cheaper route it seems. That would be cool if I could have a Sentra w/ AWD....or should I just use SR20DE tranny w/LSD?? What are my options?