I have to agree with slash on this one. Why would you spend all that money on a car to turbo when you end up spending at least 25k. You could buy a very reliable car and then buy another car and put about 10k in that and smoke everyone that you couldn't in you Sentra. These are the things to think about when you want a fast car. BTW... I really like the new Sentras.... but if you want a car that is going to be fast, then start with a car that you CAN make fast. And I know some dude might have a rediculously fast one but odds are you don't have that kind of money.
But I could be wrong.