you should gain a significantly noticable amount of horsepower, but being that you have aVX, you will have to re-wire the o2 sensor, look in refrence materials or swap info on how to do this, you will also have to lengthen the v-tec wires. Also, being that it is a b17 swap you will have to get a mount kit to put the engine in or change the bracket on the belt end of the engine to the newer style bracket and mount. Also, the b17 came with a cable tranny (supposing you car getting this out of a 92/93 integra) so you will also have to get a cable to hydro conversion or a hydraulic transmission to work in the civic. Hasport offers the mount kit.