A B16A2. It is 1.6 liter, DOHC VTEC engine. Pretty nice if I do say so.
Not much of as Si without that engine though. I hope you aren't paying much for it. Does it come with EVERYTHING else? The chassis is different from a regular civic, and they handle better though. You can get an engine for about 2 grand. Make sure you know what you are getting though, like does it come with tranny, axles, wiring harness, ecu, oilpan, distributor, etc... You should compare the price of a USDM Si to the price of a JDM B16A 2nd gen. If it's not too much more-depending on where you get it- go for the 10 extra horses. I did
