He's basically summed it up for ya, but 2 corrections: Another difference between the base and SH model of the 5th Gen preludes was that the SH had ATTS (Active Torque Transfer System), which may have been so obvious he forgot to mention it. Then again, you only asked about engines. Also, didn't the 3rd generation also include 1988 and 1989, along with 90 and 91?