There are a few changes made in the later years. The window switches inbetween the seats are different. Early versions did not have the power passenger mirror option. The climate control on N/A versions is controlled via a vaccuum "junction box" near the passenger headlight. Turbos have a system less prone to failure. The turbo's have a larger oil cooler and different tranny. The N/A has a better air filter cover- it can be polished and will keep the shine. Of course the IP is different. N/A usually had a single second seat- no split seat- most turbo's had a 60/40 split fold down back seat. N/A's have clear fog lights- turbo's have yellow fogs. N/A's have a idle adjustment insdie the car, turbo's dont. '85's had a different rear diff ratio. I have both a '80 and a '82 wagon and prefer neither over the other- they are both great