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Old 01-23-2013, 01:37 PM
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Fudman Fudman is offline
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Location: Sudbury, MA
 
Join Date: Apr 2007
Posts: 6,044
Mein Auto: '02 530i Sport auto
The two things that would usually affect engine performance are the DISA and the VANOS. The DISA modifies the intake length and the VANOS adjusts the timing, both to increase low end torque. The 97 engine engine does not have a DISA and I think it has a single VANOS. The seals should be replaced to restore the variable timing system. See the Beisan website for more info.
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