For those who are interested these are the rules you'll need live by to run your 2011 in the Factory Stock class. See if you can spot the problem with the engine tuning rules.
http://www.nmradigital.com/rules/docs/2011/FINAL/FACTORY_STOCK_2011 F.pdf
http://www.nmradigital.com/rules/docs/2011/FINAL/FACTORY_STOCK_2011 F.pdf