The race-winning No. 171 APR/Gunther VW Volkswagen GTI and No. 181 APR/BBS Volkswagen GTI, both from APR Motorsport, were found to be using unauthorized engine modifications, a violation of the general automobile regulations (4-2.2), following their 1-2 finish.
source: http://admin.grand-am.com/assets/KONI09rulesforweb9.pdf
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