So I see I basically have two options...I say two, because the S version is a POS. B21A1 which comes with the Si, or the B20A5 which comes with the 2.0 Si. Ok...5 hp difference from what I can see...but I am sure there is more to it than that. Can anyone give me any advice on which engine is better for modification? What other lude/accord engines will fit the 3rd gen? Any information/advice is welcome..Thanks!