You don't need to go to all that trouble actually, theres a line in the f1graphics.cfg that allows to to adjust the reflectivity of all the cars, look for "Environment Map Strength".
If the shinyness only happens on some circuits then you will need to edit the materials in the graphics file for the affected circuits and remove some items "self-illum" property
.
Good Luck!
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Edited 1 time(s). Last edit at 12/20/2009 03:36PM by Willb.