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I thought the 1997 Z3 only came in a i-4 1.9 liter config, i owned a 97 Z3 and could have sworn it was a 1.9 liter, anyways, you probably need to clean your MAF if the torque curve seems to flaten out at about 4k rpms. My 97 boxster is way faster than my 1997 Z3.
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