[83-944]

Need more little details? The 83's had 3 blade radiator fans stock while the 84+ had 6 blade better fans. Easy upgrade.

The Oil Pressure Relief Valve (OPRV) on the earlies is a spring and plunger type while the laters used an odd single unit OPRV.

When you pull the oil filter off you must be careful not to spill oil onto the sway bar bushings causing them to swell and fall apart.

The rear hatch glass on some will eventually "de-laminate" causing a rattling noise and water leaks. You must remove the glass and re-glue it on. This doesn't happen on every car and the rattling may just be loose locking pins.

The 87+88 N/a models have a 10.2:1 CR v/s 9.5:1 CR on earlier models resulting in 8 extra HP. You can shave the head to gain this compression easily. The 87+ also have a slighlty more aggressive cam (so I've been told). Adding the 8 valves on the S gave 30 more HP. The S head bolts on to a 2.5 block but the intake, exhaust and wiring harness must be changed as well IIRC.