I currently have a civic vx hatch and want some of the features like a moon-roof, power mirrors, cruise, etc. that the SI has and I'm wondering if any SI HB owners happy after they made the swap, if there is anyone one here that has done it. The SI would basically be like driving my VX now with a passenger in it. I'm wondering real world results in terms of how it feels and what kind of mileage hit to expect. The goal would be to fine a SI and swap the motor, trans and ecu between both cars and sell the VX with the SI motor. I think I've read that the D15z1 plugs right into the SI harness and obviously already has the vtec wires. My question is what about the O2 sensor. Thanks.