I have a 2001 honda civic dx. It is really slow and stock. I want to know which is the easiest engine to drop into this car that is fast. I want my car to be N/A so i was wondering if the b18c5 would fit or the b20z? How much horsepower does the b20 put out? How much would these engines cost?? Thanks.

First off, any B series engine will not drop in your Civic. You need to be looking into K series engines like the Si or the Type S. Second, it's going to cost a GRIP.