haha.. Its a inline-4 DOHC i-VTEC.I own a base RSX.. It is not a SOHC. Thumbs up to that.And what I like about this engine is it doesn't use the drive-by-wire method like the Civic's k-series. :]The "i" stands for "intelligent," as people say, but I think it really stands for intake.. cause that's the only change. It only changes the intake valve camshaft. =)