I paid just over $18k for a 97 M3/4 5 speed with Dinan intake, software, supersprint exhaust, 18" BBS wheels. It had 75k miles when I bought it.
I think around 22k-23k would be a good price for that car. Make sure you get a pre purchase inspection done first. Also check to see if it has any accidents, that's pretty rare to only have 26k miles on a '97.
Good Luck! It's an awesome car and you will love it.
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