Hi. I have a 1994 civic dx with the d1b7. I put a turbo on it and it runs good but I want to upgrade. Can you tell me wich engine are direct bolt ins..I was hoping for a duel overhead cam. Also is a d15b2 vtec e the same as the d16z6? Can you put the rods and pistons from the z6 in the b2? Thanks in advance.