You can also look at the head on the exhaust side (archive)

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Posted by Gary L. Daffron on August 21, 2000 at 11:57:44:

In Reply to: Re: 325e identification posted by andyman on August 20, 2000 at 22:05:23:

(posted from: ddcproxy1.ec2000.com (143.112.1.5))

if it is stamped with 2.5 it is the I, otherwise it is the E. You could also do a lemon check on it with the VIN and it will tell you what car it is.

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