Help with a 1987 or 1989 325

I'm new to the BMW game and I have a question that may sound dumb. I have either a 1987 or 1989 325 coupe. It does not have an "i" after the 325 on the back of the car. I was wondering if this meant it was different then a 325i. If it is different from a 325i please explain how. Thank you so much for reading!

325 I, 325 is, 325ix
Yours is a strait six?

The production date of the car is on the black sticker located on the driver side door jamb.
Any car with a production date of 8/86 to 7/87 is a 1987 MY car. Production date 8/88 to 7/89 is a 1989 MY car.
3....3 series model.
25...2.5 litre slant six inline.
i....Injection.
S...Sport...added bonus of a limited slip differential.
This is what the badge on the rump means.
Since these cars are 20+ years old equipment may have been altered added or deleted by the various owners during the cars usage.

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i drive a 325, it is actually a 325e it mean efficiency. They bored and made the stroke longer to 2.7. I know it says 2.5 trust me its a 2.7. They took off the "e" because sales went down with it on there people thought it was economy which it basically is

+1, "325" on back without an 'e' is still the eta. Economy, 121HP, lower-revving, ( different tach to reflect lower RPM) more torque and better mileage than a 325i. If it is a late 87-88 model--then has a little more HP, like 127hp and I think different fuel-management system. I have a 87 and like it. Sturdy engine and good mileage. They last if maintained. Welcome!