The choice is yours, but I would go for the B16. You have more tuning options. I'm not sure of your options being an auto other than converting to manual. In my 91 Civic Si, I had a Zc, B18A LS motor & now have a B16A1 the best motor I've bought. It's lot of fun also being able to hold your gears to 8200 vs 6800. Remember, one thing go for what your pockets can get you. I've gotten ripped of twice with the ZC & B18A. The power was okay motors were garbage. That's how I got the B16. Just be careful where& who install your motor. Some people only want that money. good luck! gingas