320i has a 1.8 liter here in the US.They did have a 2.0 liter but was
changed in 1980 to 1.8 but retained the 320i badges.The 1.8 liter is
smoother and more economical than the 2.0 liter.The only E21 variant to
make it to the US was the 320i,but in europe they have
315,316,318,318i,320,320i,320 with 6 cylinder,and 323i with 6 cylinder.